Asterisk+ss7: Reset message on Continuity Check fail

Asterisk Asterisk Support
1

Dear All,

I have an ivr system running on Asterisk 1.6 and chan_ss7 2.0.0. All the signalling links and circuits are stable but getting call drops frequently.

Operator have enabled ‘Continuity Check on previous circuit’ in IAM. On Continuity Check failure, operator sends RSC to the circuit which results call drop.

point code: 11831- operator
point code: 3174 - IVR server

Failure Case:

445 556.139000 11831 -> 3174 ISUP(ITU) IAM (CIC 115)
446 556.140001 3174 -> 11831 ISUP(ITU) CON (CIC 115)
447 556.174000 11831 -> 3174 ISUP(ITU) RSC (CIC 115) # INITIATE A RESET CIRCUIT FROM operator END
448 556.175001 3174 -> 11831 ISUP(ITU) RLC (CIC 115)

Success Case:

718 957.363000 11831 -> 3174 ISUP(ITU) IAM (CIC 92)
719 957.364001 3174 -> 11831 ISUP(ITU) CON (CIC 92)
720 957.400000 11831 -> 3174 ISUP(ITU) COT (CIC 92) # RECEIVED CONTINUITY TEST SUCCESS RESPONSE
1027 1246.500000 11831 -> 3174 ISUP(ITU) REL (CIC 92)
1029 1246.630001 3174 -> 11831 ISUP(ITU) RLC (CIC 92)

This happens in a regular basis. Could any one suggest the solution.

  1. Could it be a T8 timer setting problem at operator end?
  2. Could it be a ss7 stack issue.?
  3. In the failure event, operator should have sent a COT (fail) message?

ps: Wireshark traces can be shared in private.

2

Contact the card vendor. If it is DIgium, they have people employed to support the use of their hardware, whereas this forum is manned by volunteer users of the open source software.