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 [...]
Archive for the ‘Miscellaneous’ Category
Scenario#32 – SIP Calls drop after 75 minutes
Posted: July 21, 2011 in Call Manager - CUCM, CUBE - Border Element, Features, H323, Miscellaneous, Real World Scenarios, SIP3
Applying QoS for Voice Traffic
Posted: April 21, 2011 in Call Manager - CUCM, Gateways, H323, MGCP, Miscellaneous, SIPTags: QoS, RTP, Service-policy, Voice, Voice QoS
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 match [...]
Scenario#29 – Certificate expired – %CCM_UNKNOWN-CERT-0-CertExpiryEmergency
Posted: March 2, 2011 in Call Manager - CUCM, Miscellaneous, Real World ScenariosTags: Certificate Expiry, M_UNKNOWN-CERT-0-CertExpiry, SyslogSeverityMatchFound
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 3 [...]
Scenario#28 – CUCM applying DST changes 1 week before needed (2010)
Posted: October 25, 2010 in Call Manager - CUCM, Miscellaneous, Real World ScenariosTags: 7940 7960 7912 phones incorrect time, CSCtj70240, Phones gone 1hour behind
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 got [...]
Scenario#26 – Abbreviated Dial not working Cisco 7912
Posted: October 6, 2010 in Call Manager - CUCM, IP Phones & ATAs, Miscellaneous, Real World ScenariosTags: 7912 AbbrDial, Abbreviated Dial 7912 bug
I was looking into this customer issue where they upgraded from Call manager 4.x to 7.x and almost all users on 7912 phone lost their speed dials. I checked the phones and CCMUSER page and found that the dials where there but they are not able to access it. Created a new Softkey template including [...]
Scenario#25 – MoH file download from Call manager
Posted: September 25, 2010 in Call Manager - CUCM, Media Resources, Miscellaneous, Real World ScenariosTags: Download MoH, Music on hold file CLI CUCM
Came across an MoH issue for a customer where the file was missing from Subscriber. As you may be aware that an MoH file should always be uploaded across the cluster on each server to work properly. If you only upload the MoH file on Publisher then it won’t be replicated on other servers. You [...]
DSP, PVDM & Media Resources
Posted: August 25, 2010 in Call Manager - CUCM, Gateways, H323, Media Resources, MGCP, Miscellaneous, SIP, VG224Tags: Codec Complexity Flex mode, Conference DSP, DSP Resources PVDM, PVDM2-16, PVDM2-32, PVDM2-48, PVDM2-64, PVDM2-8, Transcoding DSP
The Cisco High-Density Packet Voice Digital Signal Processor (DSP) Module (PVDM2) enables Cisco Integrated Services Routers to provide high-density voice connectivity, conferencing, and transcoding capabilities in Cisco IP Communications solutions. PVDM stands for packet voice DSP module; it is the Cisco product name for the module that provides digital signal processing resources to a system. [...]
Restricting Access to Corporate & Personal Directory
Posted: August 23, 2010 in Call Manager - CUCM, IP Phones & ATAs, MiscellaneousTags: Block corporate directory, Corporate directory restriction, CUCM 7.x, Personal directory
How you can restrict access to corporate directory? If you remember, corporate directory is accessible globally from a cluster and restricting its access needs some configuration changes. In pre-CUCM 7.x you cannot accommodate it at individual level but in CUCM7.x you have flexibility. You can run a sql command to access corporate directory information from [...]
License Re-homing
Posted: August 19, 2010 in Call Manager - CUCM, MiscellaneousTags: Call manager licensing, License rehoming DLU
I came across this customer where we upgraded their CUCM from 6.x to 7.x and changed the mother board of the UCS Server (there were some issues with it). After the upgrade the Call manager had major Licensing issues as the MAC address got changed. All the units went into negative and there was an [...]
