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With Cisco CallManager on the ICS 7750 platform, the gateway cannot connect to the server for PRI backhaul

Core Issue

Using Cisco CallManager on the Integrated Communications System (ICS) 7750 platform requires configuration for getting a D channel working while doing PRI backhaul to Cisco CallManager. This sample trace from the gateway helps define the problem:

*Mar 8 13:15:43.119: send_mgcp_msg, MGCP Packet 
sent to 10.1.1.6:2427 --->*Mar 8 13:15:43.119: RSIP 1 *@MRP1 MGCP 
0.1RM: restart<---*Mar 8 13:15:47.119: send_mgcp_msg, MGCP Packet 
sent to 10.1.1.6:2427 --->*Mar 8 13:15:47.119: RSIP 1 *@MRP1 MGCP 
0.1RM: restart<---*Mar 8 13:15:51.119: send_mgcp_msg, MGCP Packet 
sent to 10.1.1.6:2427 --->
*Mar 8 13:15:51.119: RSIP 1 *@MRP1 MGCP 0.1

Resolution

The trace from the gateway indicates the gateway is sending packets. However, nothing comes back to  the gateway as a reply. With this information, and the  fact that this is an Media Gateway Control Protocol (MGCP) gateway, the configuration of the gateway inside of Cisco CallManager needs to be addressed.

Inside Cisco CallManager, the gateway is not registered. The domain name in Cisco CallManager for the gateway did not match exactly the host name of the router.

Delete the existing gateway configuration from Cisco CallManager, and create a new one, ensuring that the domain name entered for the MGCP gateway matches the host name of the router. Once the host name of the router matches the domain name entered in Cisco CallManager, everything works as expected.

For more information, refer to these documents:


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