[cisco-voip] MGCP - Fallback to SRST very often even though connectivity to CUCM is fine

[Bob Fronk]

I had this happening and found out it was an MPLS circuit going down.  Due to location of this particular site, our 12mbps MPLS circuit is supplied by multiple T1s bonded with MLPPP.

One of the T1s was going up/down several times a day (telco problem) and each time, the MLPPP would reset for a couple seconds.   The MGCP gateway responded by going into SRST and the PRI would go down for a moment.

Just something to check

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Wilson Hew
Sent: Monday, November 02, 2009 11:47 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] MGCP - Fallback to SRST very often even though connectivity to CUCM is fine

Hello there,

Greetings. I am having problem with my MGCP gateway, and I need little help and advice. My MGCP gateway is running as SRST, and it will fallback to SRST very often (twice a day). And it will go back to normal operation from fallback just after that. The connectivity from my MGCP gateway (remote site) to CUCM is fine.

I noticed my E1 is going down everytime when it falls back to SRST - is it considered normal?

My gateway is running 12.4(24)T1 and CUCM version 7.0.2.

In 'sh ccm-manager', I have the below:
--------------------------------------------------------------
TFTP retry count to shut Ports: 2

Statistics:
    Packets recvd:   857
    Recv failures:   1
    Packets xmitted: 852
    Xmit failures:   0
--------------------------------------------------------------
In 'sh mgcp stats':

 UDP pkts rx 557379, tx 558783
 Unrecognized rx pkts 0, MGCP message parsing errors 0
 Duplicate MGCP ack tx 9, Invalid versions count 0
 CreateConn rx 36256, successful 36249, failed 7
 DeleteConn rx 36274, successful 36101, failed 173
 ModifyConn rx 66178, successful 66126, failed 52
 DeleteConn tx 154, successful 154, failed 0
 NotifyRequest rx 54652, successful 54516, failed 136
 AuditConnection rx 3, successful 3, failed 0
 AuditEndpoint rx 14887, successful 8080, failed 6807
 RestartInProgress tx 6248, successful 6248, failed 0
 Notify tx 342779, successful 342779, failed 0
 ACK tx 201075, NACK tx 7191
 ACK rx 349100, NACK rx 0
 Collisions: Passive 0, Active 0
--------------------------------------------------------------

Can I tell what is wrong with the above? Apart from that, I see numbers of slips in controllers e1 increasing, and I have network-clock-participate configured.

Would appreciate if you could give me your feedback about this. Any feedback is very much appreciated.

Thanks,
Wil
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