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 [...]
Archive for the ‘MGCP’ Category
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
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Scenario#27 – RightFax Server not working – MGCP
Posted: October 14, 2010 in Call Manager - CUCM, MGCP, Real World ScenariosTags: mgcp rtp payload-type, RightFax Server MGCP
I had an interesting scenario where customer logged a case with us regarding their RightFax server not working. Those of you who don’t know what is a RightFax server can read about it here. When you dial the fax number from outside, it reaches the gateway and you hear one ringback and then a fast [...]
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. [...]
Scenario#10 – Phones showing Incorrect time
Posted: July 18, 2010 in Call Manager - CUCM, Gateways, H323, IP Phones & ATAs, MGCP, Miscellaneous, Real World ScenariosTags: NTP access-list ACL, NTP Cisco Setup
I don’t remember how many times I came across customers complaining that their phones are either x minutes ahead or x minutes behind the normal time. This is what I do whenever I come across time issues. This is for applicance based Call manager (5.x, 6.x, 7.x, 8.x) Go to OS Admin > Settings > [...]
MGCP gateway is a Survivable endpoint unlike H323 which is not survivable. What does it mean? It means that an active call through an MGCP gateway will not tear-down and the call will be preserved. As discussed already in another section that an MGCP gateway terminates Layer 2 signalling at the gateway while Backhauling Layer [...]
MGCP Gateway Setup
Posted: June 21, 2010 in Gateways, MGCPTags: configure 2811 cli mgcp, MGCP Card type WIC slot E1 T1
MGCP Configuration Using Trombone Feature: To register an MGCP gateway to call manager, follow these steps: Do a show inventory OR show diag to check the position of E1/T1 Enable the E1/T1 by using command – card type T1 0 0 OR card type T1 0 1 (whatever the case may be) Do show ver [...]
In a typical ISDN setup for an Inbound call from PSTN to an IP phone (-SCAC-) CCM - GW – PSTN Setup <——- Call proceeding ——-> Alerting ——-> Connect ——> Gateway and PSTN switch exchange Q921 Layer 2 information. Gateway registers with ISDN switch and terminates Q921 at gateway. A Q931 Setup message arrives. The [...]
General: MGCP stands for Media Gateway Control Protocol. It’s a client-server protocol which means that it has to depend on Media Controller (Call agent) for call routing. In case of Cisco this MC is a CUCM. The Call agent controls the ports of a MGCP gateway. UDP Port 2427 is used for communication between Call [...]
