Unanswered Question
Mar 16th, 2010

Gateway is a 2811 with NM-4VWIC-MBRD card.... with 5 channels E1 PRI-group using MGCP backhauled to CCM 7.02

The ISDN debug command in MGCP gateway shows "Recovery on timer expiry" , see below:

*Mar 16 18:44:59.822: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8  callref = 0x0400
        Bearer Capability i = 0x9090A3
                Standard = CCITT
                Transfer Capability = 3.1kHz Audio
                Transfer Mode = Circuit
                Transfer Rate = 64 kbit/s
        Channel ID i = 0xA98381
                Exclusive, Channel 1
        Facility i = 0x9FAA06800100820100A112020101020100800A41766179612048333233
        Calling Party Number i = 0x80, '20063'
                Plan:Unknown, Type:Unknown
        Called Party Number i = 0x80, '35000'
                Plan:Unknown, Type:Unknown
        Sending Complete
*Mar 16 18:44:59.842: ISDN Se0/0/0:15 Q931: TX -> CALL_PROC pd = 8  callref = 0x8400
        Channel ID i = 0xA98381
                Exclusive, Channel 1
*Mar 16 18:44:59.926: ISDN Se0/0/0:15 Q931: TX -> ALERTING pd = 8  callref = 0x8400
        Facility i = 0x9FAA06800100820100A1100201010201018008436973636F534950
        Progress Ind i = 0x8088 - In-band info or appropriate now available
*Mar 16 18:45:01.006: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0x0400
        Cause i = 0x85E6 - Recovery on timer expiry

I have looked at all the T3xx timers in the CUCM and they all look OK.

I went to this link :

Any ideas anyone has would be great .

i have attached my MGCP setup to this message.



I have this problem too.
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Paolo Bevilacqua Tue, 03/16/2010 - 12:55

To what are you connecting ?

The cisco side is behaving normally so you should look into the other equipment actually.

tommyphelan Tue, 03/16/2010 - 13:41

My setup is :

sip proxy server  -----> audioCodes Mediant Server 1000 ---> Cisco 2811 MGCP ----> Cisco UCM

My call comes from a sip proxy server into AudioCodes server via SIP trunk which is then connected with E1 QSIG link to MGCP gateway.

I can ring from Cisco SIP/SCCP phones through the proxy server sucessfully but when i try and ring  the Cisco phones via the proxy server

, i get the SIP recovery timer error .

I see that the SETUP msg is received in the MGCP from audioCodes server, the mgcp then sends Call_proc and Alerting messages to Cisco UCM, i am wondering what else Cisco UCM is expecting which causes a timer to expire.

The Cisco phone will ring once and then it is disconnected.

Paolo Bevilacqua Tue, 03/16/2010 - 14:10

what else Cisco UCM is expecting which causes a timer to expire.

Nothing, the timer expiration and disconnect happens in the other device, reason for which you need to investigate there why that happens.


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