Currently I'm having a problem with my voip setup because i don't get busy tone in one direction. I run some debugs like the debug isdn q931 and h225 ans1 and test a good call and bad call. Below is my call flow;
A Cisco IP phone (CallManager scenario) or Plain Old Telephone Service (POTS) phone (VoIP Toll-Bypass scenario) does not hear a busy tone or announcement message from the PSTN network. This symptom applies for both VoIP Toll-Bypass calls and IP phone to PSTN/PBX calls. The problem may occour when Cisco VoIP routers/gateways exchange signaling capabilties with the telco switch.
Do you mean that there is a problem with my signaling between the Cisco router gateway and PBX?. i'm using both isdn switch-type primary-net for the voice port configure in router. Also im just getting this no busy tone in one direction.
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