Calls to certain numbers over E1 ISDN drop after 3 minutes?

Unanswered Question
Apr 23rd, 2010

Upgraded CallManager from 3.3 to 7.1, including hardware , and upgraded the voice gateway router. Configs on both have stayed the same.

Calls to certain numbers drop after 3minutes, but the number can be dialled again straight away, i.e. the phone does not reset, but  the call to the same number will drop after 3minutes. Only happens on certain numbers and is not restricted to certain route patterns. The majoirty of calls a unaffected so in total affects about 1% of calls so there is no obvious pattern.

Termination Cause Code is 102 = Recovery on timer expiry (The call was terminated when a timer expired and a recovery routine was executed) - I have checked all the timers on gateway and CCM to no avail.

The fault can be replicated every time on the specified numbers. I have opened a Cisco TAC case and also logged with telco who are currently investigating -

I'm interested to know if anyone has come across this kind of issue before??

The circuit is ISDN E1 PRI. Debug isdn q931 for the failed calls has a different CONNECT message to the rest of the good calls....

000326: Apr 21 10:51:34.811: ISDN Se0/0/0:15 Q931: RX <- SETUP_ACK pd = 8  callref = 0x811E
        Channel ID i = 0xA98381
                Exclusive, Channel 1
000327: Apr 21 10:51:36.687: ISDN Se0/0/0:15 Q931: RX <- CALL_PROC pd = 8  callref = 0x811E
000328: Apr 21 10:51:36.691: ISDN Se0/0/0:15 Q931: RX <- ALERTING pd = 8  callref = 0x811E
        Display i = '*86*X#'
000329: Apr 21 10:51:37.251: ISDN Se0/0/0:15 Q931: RX <- CONNECT pd = 8  callref = 0x811E
       Display i = '*AA*NOT SUITABLE FOR DATA#'26
000330: Apr 21 10:51:37.255: ISDN Se0/0/0:15 Q931: TX -> CONNECT_ACK pd = 8  callref = 0x011E

000342: Apr 21 10:54:36.737: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8  callref = 0x011E
        Cause i = 0x80E6 - Recovery on timer expiry
000343: Apr 21 10:54:36.861: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8  callref = 0x811E
        Cause i = 0x8290 - Normal call clearing
        Display i = '*AA*CLEARED#'
000344: Apr 21 10:54:36.861: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x011E

If anyone has any ideas or more info is required please let me know?? Any input will be appreciated.


I have this problem too.
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Gilmar Silva Wed, 11/18/2015 - 06:03

Hello Ricardo,

Do you solved this issue?

I have the same problem in a customer.

I am thinking it is related to a network problem because it is affecting only a single site that uses VPN site-to-site.

Thank you,

Gilmar Silva


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