{"id":109,"date":"2026-05-15T05:06:35","date_gmt":"2026-05-15T05:06:35","guid":{"rendered":"https:\/\/techgyan360.com\/blog\/?p=109"},"modified":"2026-05-31T16:20:31","modified_gmt":"2026-05-31T16:20:31","slug":"cisco-ipt-interview-questions-answers","status":"publish","type":"post","link":"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/","title":{"rendered":"Top 50 Cisco IPT Interview Questions and Answers (2026 Guide)"},"content":{"rendered":"<p class=\"ds-markdown-paragraph\"><span class=\"\"><strong>Cisco IPT Interview Questions and Answers<\/strong> &#8211; So, you are aiming for a job as a Cisco IP Telephony engineer? We have spent the last decade designing and troubleshooting Cisco Unified Communications Manager (CUCM) for enterprises. We know exactly what interviewers look for.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Based on real-world configuration guides and troubleshooting scenarios, We have compiled <\/span><strong><span class=\"\">50 Cisco IPT Interview Questions and Answers<\/span><\/strong><span class=\"\">. This guide covers everything from basic clustering to advanced dial plan manipulation. Let\u2019s get you hired.<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#Part_1_Clustering_Deployment_Models_Q_1-10\" >Part 1: Clustering &amp; Deployment Models (Q 1-10)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#1_What_is_a_CUCM_Cluster\" >1. What is a CUCM Cluster?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#2_Explain_the_difference_between_Single_Site_and_Multisite_Centralized_deployment\" >2. Explain the difference between Single Site and Multisite Centralized deployment.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#3_What_is_the_maximum_one-way_delay_for_Clustering_over_the_WAN\" >3. What is the maximum one-way delay for Clustering over the WAN?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#4_What_is_the_difference_between_a_Region_and_a_Location\" >4. What is the difference between a Region and a Location?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#5_What_is_a_Media_Resource_Group_List_MRGL\" >5. What is a Media Resource Group List (MRGL)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#6_How_does_an_IP_Phone_get_its_configuration\" >6. How does an IP Phone get its configuration?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#7_What_is_the_role_of_the_Publisher_in_CUCM\" >7. What is the role of the Publisher in CUCM?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#8_What_is_H323_vs_MGCP\" >8. What is H.323 vs MGCP?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#9_What_is_the_%E2%80%9CPRI_Backhaul%E2%80%9D_in_MGCP\" >9. What is the &#8220;PRI Backhaul&#8221; in MGCP?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#10_What_is_a_Gatekeeper\" >10. What is a Gatekeeper?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#Part_2_Dial_Plan_Design_Q_11-20\" >Part 2: Dial Plan Design (Q 11-20)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#11_What_is_a_Partition_and_Calling_Search_Space_CSS\" >11. What is a Partition and Calling Search Space (CSS)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#12_Scenario_Line_CSS_vs_Device_CSS_Which_wins\" >12. Scenario: Line CSS vs. Device CSS. Which wins?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#13_What_is_a_Translation_Pattern\" >13. What is a Translation Pattern?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#14_Scenario_Non-Urgent_Translation_Patterns\" >14. Scenario: Non-Urgent Translation Patterns.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#15_What_is_a_Local_Route_Group_LRG\" >15. What is a Local Route Group (LRG)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#16_How_does_Digit_Manipulation_work_on_a_Gateway\" >16. How does Digit Manipulation work on a Gateway?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#17_Scenario_Overlapping_Numbering_Plans\" >17. Scenario: Overlapping Numbering Plans.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#18_What_is_a_Hunt_List\" >18. What is a Hunt List?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#19_What_is_the_difference_between_Ad_Hoc_and_Meet-Me_conferencing\" >19. What is the difference between Ad Hoc and Meet-Me conferencing?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#20_What_is_a_Route_Pattern_%E2%80%9C%E2%80%9D_At-sign\" >20. What is a Route Pattern &#8220;@&#8221; (At-sign)?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#Part_3_Voice_Gateways_Protocols_Q_21-30\" >Part 3: Voice Gateways &amp; Protocols (Q 21-30)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#21_Scenario_My_H323_Gateway_shows_%E2%80%9CUnknown%E2%80%9D_in_CUCM_Why\" >21. Scenario: My H.323 Gateway shows &#8220;Unknown&#8221; in CUCM. Why?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#22_What_is_the_difference_between_FXS_and_FXO\" >22. What is the difference between FXS and FXO?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#23_What_ports_does_MGCP_use\" >23. What ports does MGCP use?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#24_Scenario_%E2%80%9Cshow_isdn_status%E2%80%9D_shows_Layer_2_as_%E2%80%9CTEI_ASSIGNED%E2%80%9D_not_%E2%80%9CMULTIPLE_FRAME_ESTABLISHED%E2%80%9D\" >24. Scenario: &#8220;show isdn status&#8221; shows Layer 2 as &#8220;TEI_ASSIGNED&#8221; not &#8220;MULTIPLE_FRAME_ESTABLISHED.&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#25_What_is_a_Transcoder_XCODE\" >25. What is a Transcoder (XCODE)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#26_How_do_you_ensure_a_conference_uses_G711_and_not_G729\" >26. How do you ensure a conference uses G.711 and not G.729?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#27_What_is_a_SIP_Trunk\" >27. What is a SIP Trunk?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#28_Scenario_DTMF_tones_IVR_menus_fail_across_a_SIP_trunk\" >28. Scenario: DTMF tones (IVR menus) fail across a SIP trunk.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#29_What_is_the_default_incoming_dial-peer_in_IOS\" >29. What is the default incoming dial-peer in IOS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#30_What_is_the_purpose_of_%E2%80%9CCall_Preservation%E2%80%9D_in_MGCP\" >30. What is the purpose of &#8220;Call Preservation&#8221; in MGCP?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#Part_4_Media_Resources_QoS_Q_31-40\" >Part 4: Media Resources &amp; QoS (Q 31-40)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#31_What_is_MTP_Media_Termination_Point\" >31. What is MTP (Media Termination Point)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#32_Scenario_Software_Conference_Bridge_limitations\" >32. Scenario: Software Conference Bridge limitations.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#33_What_is_Music_on_Hold_MOH_and_the_%E2%80%9CG729_quality_issue%E2%80%9D\" >33. What is Music on Hold (MOH) and the &#8220;G.729 quality issue&#8221;?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#34_What_is_DSCP_for_CUCM_signaling\" >34. What is DSCP for CUCM signaling?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#35_Scenario_The_phone_works_but_the_%E2%80%9CHold%E2%80%9D_button_doesnt_play_music\" >35. Scenario: The phone works, but the &#8220;Hold&#8221; button doesn&#8217;t play music.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#36_What_is_the_difference_between_Barge_and_Privacy\" >36. What is the difference between Barge and Privacy?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#37_How_do_you_configure_a_Hardware_Conference_Bridge\" >37. How do you configure a Hardware Conference Bridge?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#38_What_is_Extension_Mobility_EM\" >38. What is Extension Mobility (EM)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#39_Scenario_Extension_Mobility_login_fails\" >39. Scenario: Extension Mobility login fails.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#40_What_is_Mobile_Voice_Access_MVA\" >40. What is Mobile Voice Access (MVA)?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#Part_5_Advanced_Scenarios_Q_41-50\" >Part 5: Advanced Scenarios (Q 41-50)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#41_Scenario_Call_Park_vs_Directed_Call_Park\" >41. Scenario: Call Park vs. Directed Call Park.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#42_Scenario_SRST_Failover_not_working\" >42. Scenario: SRST Failover not working.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-48\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#43_Scenario_Inbound_POTS_call_drops_immediately\" >43. Scenario: Inbound POTS call drops immediately.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-49\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#44_How_do_you_check_PRI_Layer_3_status\" >44. How do you check PRI Layer 3 status?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-50\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#45_Scenario_H323_Gateway_no_voice_path_One-way_audio\" >45. Scenario: H.323 Gateway no voice path (One-way audio).<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-51\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#46_What_is_COR_Class_of_Restriction\" >46. What is COR (Class of Restriction)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-52\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#47_Scenario_Implementing_%E2%80%9CLobby_Phone%E2%80%9D_restrictions\" >47. Scenario: Implementing &#8220;Lobby Phone&#8221; restrictions.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-53\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#48_What_is_the_%E2%80%9CMusic_on_Hold%E2%80%9D_active_vs_network_hold\" >48. What is the &#8220;Music on Hold&#8221; active vs network hold?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-54\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#49_Scenario_Video_call_fails_over_inter-cluster_trunk\" >49. Scenario: Video call fails over inter-cluster trunk.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-55\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#50_Final_Scenario_The_%E2%80%9COne-Way_Audio%E2%80%9D_checklist\" >50. Final Scenario: The &#8220;One-Way Audio&#8221; checklist.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-56\" href=\"https:\/\/techgyan360.com\/blog\/cisco-ipt-interview-questions-answers\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Part_1_Clustering_Deployment_Models_Q_1-10\"><\/span><span class=\"\">Part 1: Clustering &amp; Deployment Models (Q 1-10)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">These questions test your knowledge of how CUCM servers talk to each other.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_What_is_a_CUCM_Cluster\"><\/span><span class=\"\">1. What is a CUCM Cluster?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A cluster is a set of CUCM servers that share the same database and resources. It acts as a single call processing agent. You can have only one\u00a0<\/span><strong><span class=\"\">Publisher<\/span><\/strong><span class=\"\">\u00a0(read\/write DB) per cluster and multiple\u00a0<\/span><strong><span class=\"\">Subscribers<\/span><\/strong><span class=\"\">\u00a0(read-only DB for redundancy).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Explain_the_difference_between_Single_Site_and_Multisite_Centralized_deployment\"><\/span><span class=\"\">2. Explain the difference between Single Site and Multisite Centralized deployment.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Single Site:<\/span><\/strong><span class=\"\">\u00a0One cluster in one location. All phones use high-bandwidth codecs (G.711). If the WAN is down, the PSTN handles everything.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Centralized:<\/span><\/strong><span class=\"\">\u00a0One cluster in a data center supports remote branch phones over the WAN. Remote sites use\u00a0<\/span><strong><span class=\"\">SRST<\/span><\/strong><span class=\"\">\u00a0(Survivable Remote Site Telephony) to make calls if the WAN fails.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"3_What_is_the_maximum_one-way_delay_for_Clustering_over_the_WAN\"><\/span><span class=\"\">3. What is the maximum one-way delay for Clustering over the WAN?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">To avoid call setup failures, the maximum one-way delay between any two CUCM servers must not exceed\u00a0<\/span><strong><span class=\"\">40 milliseconds<\/span><\/strong><span class=\"\">\u00a0(or 80 ms round-trip).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_What_is_the_difference_between_a_Region_and_a_Location\"><\/span><span class=\"\">4. What is the difference between a Region and a Location?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Region:<\/span><\/strong><span class=\"\">\u00a0Defines which\u00a0<\/span><strong><span class=\"\">codec<\/span><\/strong><span class=\"\">\u00a0(G.711 vs G.729) is used between two devices.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Location:<\/span><\/strong><span class=\"\">\u00a0Defines the\u00a0<\/span><strong><span class=\"\">bandwidth limit<\/span><\/strong><span class=\"\">\u00a0for a WAN link for Call Admission Control (CAC).<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"5_What_is_a_Media_Resource_Group_List_MRGL\"><\/span><span class=\"\">5. What is a Media Resource Group List (MRGL)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">It is a prioritized list of resources (like conference bridges or MTPs). It tells CUCM\u00a0<\/span><em><span class=\"\">which<\/span><\/em><span class=\"\">\u00a0hardware resource to use first (e.g., use the local DSP before using a software resource).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_How_does_an_IP_Phone_get_its_configuration\"><\/span><span class=\"\">6. How does an IP Phone get its configuration?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Phone powers on (PoE).<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Gets VLAN via CDP.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Requests DHCP (looks for Option 150).<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Downloads config file from TFTP.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Registers to CUCM.<\/span><\/p>\n<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"7_What_is_the_role_of_the_Publisher_in_CUCM\"><\/span><span class=\"\">7. What is the role of the Publisher in CUCM?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The Publisher is the &#8220;first node.&#8221; It has the only read\/write copy of the SQL database. Subscribers replicate from it. If the Publisher is down, call processing continues, but you cannot make admin changes.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_What_is_H323_vs_MGCP\"><\/span><span class=\"\">8. What is H.323 vs MGCP?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">H.323:<\/span><\/strong><span class=\"\">\u00a0Peer-to-peer. The gateway has intelligence (dial-peers). Harder to configure but feature-rich.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">MGCP:<\/span><\/strong><span class=\"\">\u00a0Master\/slave. CUCM controls every port on the gateway. Easier dial plan (no dial peers on the GW), but the gateway is dumb.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"9_What_is_the_%E2%80%9CPRI_Backhaul%E2%80%9D_in_MGCP\"><\/span><span class=\"\">9. What is the &#8220;PRI Backhaul&#8221; in MGCP?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">It is when the gateway terminates ISDN Layer 2 (Q.921), but forwards Layer 3 (Q.931) signals back to CUCM via TCP port 2428. CUCM handles the call routing.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_What_is_a_Gatekeeper\"><\/span><span class=\"\">10. What is a Gatekeeper?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">An H.323 entity that provides address translation (E.164 to IP) and bandwidth management for H.323 endpoints and gateways.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Part_2_Dial_Plan_Design_Q_11-20\"><\/span><span class=\"\">Part 2: Dial Plan Design (Q 11-20)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Dial plans are the heart of\u00a0<\/span><strong><span class=\"\">Cisco IPT Interview Questions and Answers<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_What_is_a_Partition_and_Calling_Search_Space_CSS\"><\/span><span class=\"\">11. What is a Partition and Calling Search Space (CSS)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Partition:<\/span><\/strong><span class=\"\">\u00a0A logical group of route patterns or directory numbers (like a &#8220;folder&#8221;).<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">CSS:<\/span><\/strong><span class=\"\">\u00a0An ordered list of Partitions. It defines\u00a0<\/span><em><span class=\"\">what<\/span><\/em><span class=\"\">\u00a0a phone is allowed to dial.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"12_Scenario_Line_CSS_vs_Device_CSS_Which_wins\"><\/span><span class=\"\">12. Scenario: Line CSS vs. Device CSS. Which wins?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0The intersection wins (most restrictive).<\/span><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><em><span class=\"\">Line CSS<\/span><\/em><span class=\"\">\u00a0(User level) +\u00a0<\/span><em><span class=\"\">Device CSS<\/span><\/em><span class=\"\">\u00a0(Phone level).<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">CUCM looks at both. If the Line CSS allows &#8220;Local&#8221; but Device CSS blocks &#8220;Long Distance,&#8221; the call is\u00a0<\/span><strong><span class=\"\">blocked<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"13_What_is_a_Translation_Pattern\"><\/span><span class=\"\">13. What is a Translation Pattern?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">It changes digits\u00a0<\/span><em><span class=\"\">before<\/span><\/em><span class=\"\">\u00a0routing. Unlike a route pattern, it does not select a gateway; it just manipulates digits and sends the call back for a second digit analysis.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"14_Scenario_Non-Urgent_Translation_Patterns\"><\/span><span class=\"\">14. Scenario: Non-Urgent Translation Patterns.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">In CUCM 7.x+, if you configure a pattern for\u00a0<\/span><code>9011.<\/code><span class=\"\">\u00a0(international) and set it to\u00a0<\/span><strong><span class=\"\">Urgent<\/span><\/strong><span class=\"\">, the system matches the first digit and routes immediately. This breaks variable-length dialing. You must set international patterns to\u00a0<\/span><strong><span class=\"\">Non-Urgent<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"15_What_is_a_Local_Route_Group_LRG\"><\/span><span class=\"\">15. What is a Local Route Group (LRG)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A feature that simplifies TEHO (Tail End Hop Off). It automatically uses a gateway\u00a0<\/span><em><span class=\"\">local to the called party<\/span><\/em><span class=\"\">\u00a0without building hundreds of explicit route lists.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"16_How_does_Digit_Manipulation_work_on_a_Gateway\"><\/span><span class=\"\">16. How does Digit Manipulation work on a Gateway?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Using commands like\u00a0<\/span><code>prefix<\/code><span class=\"\">,\u00a0<\/span><code>forward-digits<\/code><span class=\"\">, or\u00a0<\/span><code>translation-profile<\/code><span class=\"\">\u00a0to strip access codes (like 9) or add area codes.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"17_Scenario_Overlapping_Numbering_Plans\"><\/span><span class=\"\">17. Scenario: Overlapping Numbering Plans.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Two sites both have extension &#8220;1001.&#8221; How do they call each other?<\/span><br \/>\n<strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0You implement\u00a0<\/span><strong><span class=\"\">Site Code dialing<\/span><\/strong><span class=\"\">. The user dials an Intersite Prefix (e.g., 8) + Site Code (e.g., 81) + Extension (1001). The gateway strips the 881 before sending to the remote site.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"18_What_is_a_Hunt_List\"><\/span><span class=\"\">18. What is a Hunt List?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A configuration that allows calls to roll over to different line groups. For example: Ring Group A for 10 seconds, then Group B.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"19_What_is_the_difference_between_Ad_Hoc_and_Meet-Me_conferencing\"><\/span><span class=\"\">19. What is the difference between Ad Hoc and Meet-Me conferencing?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Ad Hoc:<\/span><\/strong><span class=\"\">\u00a0An active user adds participants one by one (starts as a 2-way call, becomes 3-way).<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Meet-Me:<\/span><\/strong><span class=\"\">\u00a0Users dial a specific conference bridge number at a scheduled time.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"20_What_is_a_Route_Pattern_%E2%80%9C%E2%80%9D_At-sign\"><\/span><span class=\"\">20. What is a Route Pattern &#8220;@&#8221; (At-sign)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">It uses a Route Filter to match the North American Numbering Plan (NANP) patterns automatically (e.g., distinguishing 7-digit local from 11-digit long distance).<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Part_3_Voice_Gateways_Protocols_Q_21-30\"><\/span><span class=\"\">Part 3: Voice Gateways &amp; Protocols (Q 21-30)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"21_Scenario_My_H323_Gateway_shows_%E2%80%9CUnknown%E2%80%9D_in_CUCM_Why\"><\/span><span class=\"\">21. Scenario: My H.323 Gateway shows &#8220;Unknown&#8221; in CUCM. Why?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0H.323 is peer-to-peer. It does not &#8220;register&#8221; like MGCP. Ensure the gateway IP is correct, and verify the dial-peer\u00a0<\/span><code>session target<\/code><span class=\"\">\u00a0points to CUCM. Also, check that the\u00a0<\/span><strong><span class=\"\">Gatekeeper<\/span><\/strong><span class=\"\">\u00a0(if used) is resolving the alias.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"22_What_is_the_difference_between_FXS_and_FXO\"><\/span><span class=\"\">22. What is the difference between FXS and FXO?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">FXS (Wall Plug):<\/span><\/strong><span class=\"\">\u00a0Provides dial tone, battery, and ring voltage to a phone.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">FXO (Phone Plug):<\/span><\/strong><span class=\"\">\u00a0Receives dial tone (connects to the wall). You connect an FXO port to an FXS port.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"23_What_ports_does_MGCP_use\"><\/span><span class=\"\">23. What ports does MGCP use?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">UDP 2427:<\/span><\/strong><span class=\"\">\u00a0Call Control (Gateway &lt;-&gt; CUCM).<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">TCP 2428:<\/span><\/strong><span class=\"\">\u00a0Keepalives and PRI Backhaul.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"24_Scenario_%E2%80%9Cshow_isdn_status%E2%80%9D_shows_Layer_2_as_%E2%80%9CTEI_ASSIGNED%E2%80%9D_not_%E2%80%9CMULTIPLE_FRAME_ESTABLISHED%E2%80%9D\"><\/span><span class=\"\">24. Scenario: &#8220;show isdn status&#8221; shows Layer 2 as &#8220;TEI_ASSIGNED&#8221; not &#8220;MULTIPLE_FRAME_ESTABLISHED.&#8221;<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Layer 2 is down. This usually means:<\/span><\/p>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Wrong\u00a0<\/span><code>isdn switch-type<\/code><span class=\"\">\u00a0configured.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Losing clocking on the line.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The Telco side is down. Check with the provider.<\/span><\/p>\n<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"25_What_is_a_Transcoder_XCODE\"><\/span><span class=\"\">25. What is a Transcoder (XCODE)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A DSP resource that converts a stream from one codec to another (e.g., G.711 on the LAN to G.729 on the WAN).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"26_How_do_you_ensure_a_conference_uses_G711_and_not_G729\"><\/span><span class=\"\">26. How do you ensure a conference uses G.711 and not G.729?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Place the conference bridge resource in a\u00a0<\/span><strong><span class=\"\">Region<\/span><\/strong><span class=\"\">\u00a0that is configured for G.711 to the phones. The\u00a0<\/span><code>Region<\/code><span class=\"\">\u00a0setting overrides the codec negotiation.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"27_What_is_a_SIP_Trunk\"><\/span><span class=\"\">27. What is a SIP Trunk?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A connection between CUCM and a SIP provider or another PBK using Session Initiation Protocol. It uses port 5060 (UDP or TCP).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"28_Scenario_DTMF_tones_IVR_menus_fail_across_a_SIP_trunk\"><\/span><span class=\"\">28. Scenario: DTMF tones (IVR menus) fail across a SIP trunk.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Low-bandwidth codecs (G.729) destroy DTMF fidelity. Enable\u00a0<\/span><strong><span class=\"\">DTMF Relay<\/span><\/strong><span class=\"\">. On SIP trunks, use\u00a0<\/span><code>dtmf-relay rtp-nte<\/code><span class=\"\">\u00a0or\u00a0<\/span><code>sip-notify<\/code><span class=\"\">\u00a0to send digits out-of-band.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"29_What_is_the_default_incoming_dial-peer_in_IOS\"><\/span><span class=\"\">29. What is the default incoming dial-peer in IOS?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">POTS dial-peer 0 (zero). It is used when no specific\u00a0<\/span><code>incoming called-number<\/code><span class=\"\">\u00a0matches. Usually, we configure a POTS dial-peer with\u00a0<\/span><code>incoming called-number .<\/code><span class=\"\">\u00a0to catch all calls.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"30_What_is_the_purpose_of_%E2%80%9CCall_Preservation%E2%80%9D_in_MGCP\"><\/span><span class=\"\">30. What is the purpose of &#8220;Call Preservation&#8221; in MGCP?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">If the CUCM connection drops, MGCP maintains existing calls so users don&#8217;t get disconnected during a failover.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Also Check<\/strong> &#8211; <a href=\"https:\/\/techgyan360.com\/blog\/amazon-connect-outbound-campaign-interview-questions\/\">50 Amazon Connect Outbound Campaign Interview Questions and Answers (2026)<\/a><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Part_4_Media_Resources_QoS_Q_31-40\"><\/span><span class=\"\">Part 4: Media Resources &amp; QoS (Q 31-40)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"31_What_is_MTP_Media_Termination_Point\"><\/span><span class=\"\">31. What is MTP (Media Termination Point)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A resource that bridges H.245 streams. It is required for H.323 v1 endpoints to hold calls or for SIP to SCCP DTMF interworking.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"32_Scenario_Software_Conference_Bridge_limitations\"><\/span><span class=\"\">32. Scenario: Software Conference Bridge limitations.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Software bridges (Cisco IP Voice Media Streaming App) only mix\u00a0<\/span><strong><span class=\"\">G.711<\/span><\/strong><span class=\"\">\u00a0streams. If you have G.729 participants, you must insert a Transcoder before the conference or use hardware DSPs.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"33_What_is_Music_on_Hold_MOH_and_the_%E2%80%9CG729_quality_issue%E2%80%9D\"><\/span><span class=\"\">33. What is Music on Hold (MOH) and the &#8220;G.729 quality issue&#8221;?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">MoH streams music. G.729 is optimized for human speech, not music. It makes MoH sound &#8220;tinny.&#8221;\u00a0<\/span><strong><span class=\"\">Solution:<\/span><\/strong><span class=\"\">\u00a0Put the MOH server in a separate Region so MoH streams G.711 while voice stays G.729.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"34_What_is_DSCP_for_CUCM_signaling\"><\/span><span class=\"\">34. What is DSCP for CUCM signaling?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Intra-cluster traffic (ICCS) uses\u00a0<\/span><strong><span class=\"\">IP Precedence 3 (DSCP 24)<\/span><\/strong><span class=\"\">. Voice RTP payload uses\u00a0<\/span><strong><span class=\"\">DSCP 46 (EF)<\/span><\/strong><span class=\"\">.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"35_Scenario_The_phone_works_but_the_%E2%80%9CHold%E2%80%9D_button_doesnt_play_music\"><\/span><span class=\"\">35. Scenario: The phone works, but the &#8220;Hold&#8221; button doesn&#8217;t play music.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Check the\u00a0<\/span><strong><span class=\"\">MOH Audio Source<\/span><\/strong><span class=\"\">. If the server is in &#8220;Down&#8221; state or no files are uploaded, it will play silence. Also, verify the MRGL assigned to the device includes the MOH server.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"36_What_is_the_difference_between_Barge_and_Privacy\"><\/span><span class=\"\">36. What is the difference between Barge and Privacy?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Barge:<\/span><\/strong><span class=\"\">\u00a0Allows a user to join a shared line call in progress.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Privacy:<\/span><\/strong><span class=\"\">\u00a0Blocks other phones with the shared line from seeing or barging your call.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"37_How_do_you_configure_a_Hardware_Conference_Bridge\"><\/span><span class=\"\">37. How do you configure a Hardware Conference Bridge?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Configure the router with\u00a0<\/span><code>dspfarm<\/code><span class=\"\">.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Register it to CUCM via SCCP using\u00a0<\/span><code>sccp local<\/code><span class=\"\">\u00a0and\u00a0<\/span><code>sccp ccm<\/code><span class=\"\">.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Add the device to CUCM as a &#8220;Conference Bridge.&#8221;<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Add it to an MRGL.<\/span><\/p>\n<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"38_What_is_Extension_Mobility_EM\"><\/span><span class=\"\">38. What is Extension Mobility (EM)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Users log into any phone in the cluster and their personal profile (line appearances, speed dials) loads onto that phone.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"39_Scenario_Extension_Mobility_login_fails\"><\/span><span class=\"\">39. Scenario: Extension Mobility login fails.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Check the\u00a0<\/span><strong><span class=\"\">User Device Profile<\/span><\/strong><span class=\"\">. The profile must be assigned to a compatible phone model (e.g., a 7960 profile won&#8217;t load on a 7940). Also, verify the user has a PIN configured, not just a password.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"40_What_is_Mobile_Voice_Access_MVA\"><\/span><span class=\"\">40. What is Mobile Voice Access (MVA)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Allows a cell phone user to dial into CUCM, enter a PIN, and get an internal dial tone. They can then make business calls that appear to come from their desk phone.<\/span><\/p>\n<p><strong>Also Check<\/strong> &#8211; <a href=\"https:\/\/tools.kloudmint.com\/aws-cloud-tools\/parquet-file-reader.php\">Parquet File Reader Tool<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Part_5_Advanced_Scenarios_Q_41-50\"><\/span><span class=\"\">Part 5: Advanced Scenarios (Q 41-50)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"41_Scenario_Call_Park_vs_Directed_Call_Park\"><\/span><span class=\"\">41. Scenario: Call Park vs. Directed Call Park.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Scenario:<\/span><\/strong><span class=\"\">\u00a0A receptionist parks a call, but the CEO retrieves the wrong call.<\/span><br \/>\n<strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Use\u00a0<\/span><strong><span class=\"\">Directed Call Park<\/span><\/strong><span class=\"\">. The admin configures a retrieval prefix (e.g.,\u00a0<\/span>*<span class=\"\">51<\/span>*<span class=\"\">). The user must dial the park slot number (e.g., 01) to get the call. This prevents accidental pickups.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"42_Scenario_SRST_Failover_not_working\"><\/span><span class=\"\">42. Scenario: SRST Failover not working.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">The WAN is down, but SCCP phones show &#8220;Registering&#8221; and never go to SRST.<\/span><br \/>\n<strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Check the\u00a0<\/span><strong><span class=\"\">SRST Reference<\/span><\/strong><span class=\"\">\u00a0in the Device Pool. Ensure the\u00a0<\/span><code>ip source-address<\/code><span class=\"\">\u00a0on the router matches the SRST Reference IP. Also, ensure\u00a0<\/span><code>call-manager-fallback<\/code><span class=\"\">\u00a0is configured.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"43_Scenario_Inbound_POTS_call_drops_immediately\"><\/span><span class=\"\">43. Scenario: Inbound POTS call drops immediately.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0It likely failed Inbound Dial Peer matching. Use\u00a0<\/span><code>debug voip ccapi inout<\/code><span class=\"\">. If no dial peer is matched (service using\u00a0<\/span><code>default dial-peer 0<\/code><span class=\"\">), the call treats it as a modem call and drops. Create a dial-peer with\u00a0<\/span><code>incoming called-number .<\/code><span class=\"\">\u00a0and\u00a0<\/span><code>direct-inward-dial<\/code><span class=\"\">.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"44_How_do_you_check_PRI_Layer_3_status\"><\/span><span class=\"\">44. How do you check PRI Layer 3 status?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><code>show isdn status<\/code><span class=\"\">\u00a0-&gt; Look for &#8220;Layer 3 Status:\u00a0<\/span><strong><span class=\"\">Active Layer 3 Call(s)<\/span><\/strong><span class=\"\">&#8220;. If it is 0, but the phone number is good, Layer 3 is down.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"45_Scenario_H323_Gateway_no_voice_path_One-way_audio\"><\/span><span class=\"\">45. Scenario: H.323 Gateway no voice path (One-way audio).<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0H.323 often has routing issues. Ensure\u00a0<\/span><code>no ip nat inside<\/code><span class=\"\">\u00a0on the voice VLAN interface. If NAT is involved, you need an MTP to rewrite the IP addresses in the H.245 headers.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"46_What_is_COR_Class_of_Restriction\"><\/span><span class=\"\">46. What is COR (Class of Restriction)?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">A feature on IOS gateways (like SRST) that acts as a &#8220;Lock and Key.&#8221; The incoming dial peer has a &#8220;Key&#8221; (COR list), and the outgoing dial peer has a &#8220;Lock.&#8221; The call only proceeds if the Key unlocks the Lock.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"47_Scenario_Implementing_%E2%80%9CLobby_Phone%E2%80%9D_restrictions\"><\/span><span class=\"\">47. Scenario: Implementing &#8220;Lobby Phone&#8221; restrictions.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Create a new Partition for &#8220;Local_Calls.&#8221; Put the Lobby Phone&#8217;s CSS in a Partition that\u00a0<\/span><em><span class=\"\">only<\/span><\/em><span class=\"\">\u00a0contains local route patterns. Remove the Partition that contains &#8220;Long Distance&#8221; (91[2-9]&#8230;).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"48_What_is_the_%E2%80%9CMusic_on_Hold%E2%80%9D_active_vs_network_hold\"><\/span><span class=\"\">48. What is the &#8220;Music on Hold&#8221; active vs network hold?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Active Hold:<\/span><\/strong><span class=\"\">\u00a0User presses the Hold button (User hears MoH).<\/span><\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Network Hold:<\/span><\/strong><span class=\"\">\u00a0The call is parked or transferred (Caller hears MoH).<\/span><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"49_Scenario_Video_call_fails_over_inter-cluster_trunk\"><\/span><span class=\"\">49. Scenario: Video call fails over inter-cluster trunk.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Answer:<\/span><\/strong><span class=\"\">\u00a0Video often requires high bandwidth. Verify the\u00a0<\/span><strong><span class=\"\">Locations<\/span><\/strong><span class=\"\">\u00a0Bandwidth (set to 384k+). Also, note that the Cisco VT Camera Wideband codec is\u00a0<\/span><strong><span class=\"\">not supported<\/span><\/strong><span class=\"\">\u00a0over inter-cluster trunks (ICT).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"50_Final_Scenario_The_%E2%80%9COne-Way_Audio%E2%80%9D_checklist\"><\/span><span class=\"\">50. Final Scenario: The &#8220;One-Way Audio&#8221; checklist.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">You are on site and a user cannot hear the PSTN caller, but the PSTN hears them.<\/span><br \/>\n<strong><span class=\"\">Step 1:<\/span><\/strong><span class=\"\">\u00a0Check the\u00a0<\/span><strong><span class=\"\">Region<\/span><\/strong><span class=\"\">\u00a0configuration. Is the codec match correct?<\/span><br \/>\n<strong><span class=\"\">Step 2:<\/span><\/strong><span class=\"\">\u00a0Check\u00a0<\/span><strong><span class=\"\">MTP Required<\/span><\/strong><span class=\"\">\u00a0on the Trunk. Is it checked unnecessarily?<\/span><br \/>\n<strong><span class=\"\">Step 3:<\/span><\/strong><span class=\"\">\u00a0Check\u00a0<\/span><strong><span class=\"\">IP Routing<\/span><\/strong><span class=\"\">. Does the voice gateway have a route back to the phone subnet?<\/span><br \/>\n<strong><span class=\"\">Step 4:<\/span><\/strong><span class=\"\">\u00a0Check\u00a0<\/span><strong><span class=\"\">NAT<\/span><\/strong><span class=\"\">. Is the gateway sending private IPs in the SDP?<\/span><\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><span class=\"\">Conclusion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">Mastering these\u00a0<\/span><strong><span class=\"\">Cisco IPT Interview Questions and Answers<\/span><\/strong><span class=\"\">\u00a0requires knowing the theory and the &#8220;why&#8221; behind the commands. Focus on the scenarios\u2014most failures are due to Dial Peer mis-matches, Region codec mismatches, or MGCP registration details.<\/span><\/p>\n<p class=\"ds-markdown-paragraph\"><span class=\"\">If you understand the difference between a Publisher and Subscriber, and when to use a Transcoder versus an MTP, you are already ahead of 80% of candidates. Good luck with your Cisco IPT interview<\/span><\/p>\n<p><strong>Also Check<\/strong> &#8211; <a href=\"https:\/\/techgyan360.com\/blog\/cisco-gatekeeper-isdn-interview-questions\/\">Cisco Gatekeeper and ISDN interview questions and answers<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cisco IPT Interview Questions and Answers &#8211; So, you are aiming for a job as a Cisco IP Telephony engineer? We have spent the last decade designing and troubleshooting Cisco&hellip;<\/p>\n","protected":false},"author":1,"featured_media":111,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,14],"tags":[31,21],"class_list":["post-109","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cisco-contact-centre-hub","category-interview-questions-and-answers","tag-cisco-ipt-contact-center","tag-cisco-ipt-interview-questions-and-answers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top 50 Cisco IPT Interview Questions and Answers (2026 Guide) - TechGyan360.Com<\/title>\n<meta name=\"description\" content=\"Prepare for your next job with 50 real-world Cisco IPT Interview Questions and Answers. 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