Category Archives: Unified Communications

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 ephoneContinueContinue 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 (CallContinueContinue 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 itContinueContinue 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 issueContinueContinue reading “Scenario#31 – Calls over ICT have delayed Voice”

Scenario#30 – Local Agent not Responding

Came across an interesting issue where Customer was not able to access Disaster Recovery drop downs. I tried it myself and I was getting as follows: So it was Local agent not responding – I tried restarting the Cisco DRF Master and Local but that didn’t help. This is what I did to resolve theContinueContinue reading “Scenario#30 – Local Agent not Responding”

Applying QoS for Voice Traffic

QoS is very important for Voice traffic which is delay sensitive. I won’t go into details of QoS over here and will just explain the configuration we normally use on a Voice gateway for QoS. class-map match-any Voice-RTP match ip precedence 5 match ip dscp ef match ip rtp 16384 16383 class-map match-any Voice-Cntl matchContinueContinue reading “Applying QoS for Voice Traffic”

Scenario#29 – Certificate expired – %CCM_UNKNOWN-CERT-0-CertExpiryEmergency

For one of our customer we noticed several RTMT SyslogSeverityMatchFound alerts generated every few minutes for Certificates expiration. The alerts I was getting were as follows: Feb 15 16:00:00, CCM-PUB, Emergency, Cisco Certificate Monitor, : 8947: Feb 15 16:00:00.57 UTC : %CCM_UNKNOWN-CERT-0-CertExpiryEmergency: Certificate Expiry EMERGENCY_ALARM Message:Certificate expiration Notification. Certificate name:tomcat Unit:tomcat Type:own-cert Expiration:Wed Mar 3ContinueContinue reading “Scenario#29 – Certificate expired – %CCM_UNKNOWN-CERT-0-CertExpiryEmergency”

Scenario#29 – Interworking error -0x80FF

I came across this issue with one of  our customer last week where a call was coming in to receptionist at Site ‘A’ but she was not able to transfer the call to someone at Site ‘B’. They had Centralized deployment and all phones on branch sites were registered to Central site. The call wasContinueContinue reading “Scenario#29 – Interworking error -0x80FF”

Scenario#28 – CUCM applying DST changes 1 week before needed (2010)

Today was a hectic day. I walked into my office and immediately started getting calls that phones have gone 1 hour behind. I was a bit surprised as Daylight Saving will be finishing here in UK on 31st October so how come phones gone behind a week earlier. I thought may be customer has gotContinueContinue reading “Scenario#28 – CUCM applying DST changes 1 week before needed (2010)”