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 ‘SIP’ 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 [...]
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. [...]
