My gateway is runnig IOS c3845-advipservicesk9-mz.124-4.T1. It has 2 ISDN PRA interfaces and is talking to a SWYX server that hosts tens of phones. When a call is placed from PSTN to a number in SWYX server and when a SIP 488(Not Acceptable Here) or 403(Forbbiden) message is received from the SWYX, the ACK message is sent back. Then the call SHOULD STOP. But the call does not stop. It flows out of another PRA, and comes back again in the first PRA. The loop continues untill all channels are taken and no other calls can be made. This is disastrous.
How can I stop the IOS from carrying on the call when it receives such messages?
Any guidance is appreciated.