Hello

I’m trying to implement call forwarding unconditional redirect to a PSTN destination.

Call flow: PSTNàSIP-CallFWàPSTN

On my PSTN side I have a cisco AS5300. We succesfuly forwarded to a PSTN destination.

We have changed calling party (for billing purposes) and called party to complete call forwarding. In other words we generate a new call attempt.

Everything looks ok but if calling party (PSTN originating side) finishes the call before called party answers (PSTN destination side), cisco GW receives a CANCEL message and it answers with message 481 Call leg/Transaction does not exist to the Proxy.

The call still ringing and goes to voice mail on PSTN destination side that means cisco GW never receives a BYE regarding to the original INVITE message.

Can you give me a hint on how to handle this issue ?

Thanks

Captured attached

Ariadne L. Ramos Solís

Depto. Ingeniería

Aprovisionamiento y Señalización VoIP

Galaxy Communications Corp.

Tel. 2000117

e-mail aramos@clarocom.com