Scenario#33 – Phones not registering CUCME

Interesting case today. I had a call from customer saying they had a power cut and when the power was restored all their phones went into ‘Registering’ status. I initially thought it could be a network issue from switches to CUCME gateway as the config was looking fine to me. I did a show ephone summary and found all of them in ‘Unregistered’ status. Nothing changed really, the config was all ok and these phones were all working fine few minutes before. So what has gone wrong? I started going through the config if anything has changed but nothing changed. … Continue reading Scenario#33 – Phones not registering CUCME

Scenario#32 – SIP Calls drop after 75 minutes

I had an interesting case where SIP calls over a SIP trunk were dropping after like 75 minutes. The duration was not confirmed as sometimes it use to drop even before 75 minutes. I looked into few CCSIP debugs (debug ccsip messages) and found that the ‘BYE’ message was actually coming from our end (Call manager/Gateway). Platform information: CCM: System version: 7.1.3.32900-4 CUBE-10#sh ver Cisco IOS Software, 3800 Software (C3825-ADVIPSERVICESK9-M), Version 12.4(24)T4, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2010 by Cisco Systems, Inc. Compiled Fri 03-Sep-10 09:15 by prod_rel_team ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1) CUBE-10 … Continue reading Scenario#32 – SIP Calls drop after 75 minutes

How to Configure “Extension Mobility”

I had a request to do a quick write up on how to configure extension mobility properly. These are the steps involved (considering Call manager Linux versions): 1 – Configure extension mobility service by going into Device > Device settings > Phone Services The service URL is : http://call-manager-IP:8080/emapp/EMAppServlet?device=#DEVICENAME# If you want to set it up as an Enterprise service then check that box “Enterprise Subscription” otherwise leave it. If you check that box, extension mobility service will appear globally for all phones and you won’t be able to find this service under phone Subscribe services in Step 2. If … Continue reading How to Configure “Extension Mobility”

Scenario#31 – Calls over ICT have delayed Voice

I had an interesting case last week where calls over ICT trunk would connect but then either party will not hear each other for 8-10 seconds. The issue was first reported from US users trying to reach UK users over an Inter-cluster trunk (Non-GK). Both clusters had two call managers version 8.0.3. The whole issue started after US call managers were re-located and their IP addresses were changed. The ping response between two clusters was about 145ms which wasn’t too bad. I did a test call to a UK phone by connecting my IP communicator to US (due to time … Continue reading Scenario#31 – Calls over ICT have delayed Voice