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MGCP and Call Preservation

Hello Experts,

I am using MGCP BTW CallManager and the Gateway with PRI. Yesterday we lost the CallManager and all phones registered with our SRST router (Backup). When CallManager went down all active calls dropped and when it came up(recovery) all active calls dropped again. Is it a normal behavior? Is there anyway that I can avoid the call drop?

Thanks,

BT

2 REPLIES

Re: MGCP and Call Preservation

BT,

What version of CCM are you using? Prior to CCM 3.1, both Layer 2 and Layer 3 signaling were passed to CCM by the gateway. If you lose Layer 2 on a PRI, you lose the D channel and therefore, all B channels. CCM 3.1 and later use the PRI backhaul method which terminates Layer 2 on the voice gateway. So, if the connection to CCM is lost, the D channel stays up and the call is preserved. Take a look at the following link.

http://www.cisco.com/en/US/products/ps6441/products_configuration_guide_chapter09186a0080541bf5.html

Hope this helps. If so, please rate the post.

Brandon

Bronze

Re: MGCP and Call Preservation

Bahman,

on switchback & failover there is call preservation on active call, but there is definitly no preservation during fallback.

http://www.cisco.com/en/US/products/ps5855/products_data_sheet09186a0080182d38.html

greetings

mehmet

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