[Serusers] problem cancelling a call with CANCEL request

[Daniel-Constantin Mierla]

On 04/22/05 08:28, Esteban Monturus wrote:

>	I am installing a SIP proxy in a Linux machine in the local network of my 
>office. I have implemented a SIP proxy with SER 0.8.10.
>
Use at least SER 0.8.14 or, maybe better, 0.9.0. SER 0.8.10 is so 
obsolete that nobody knows what bugs were at that time.

Daniel

> The function of the 
>SIP proxy is to let users talk each other without knowing the IP where each 
>one is reachable. My problem appears when the caller wants to cancel the 
>call because the callee does not answer. Since I want the calle's phone to 
>stop ringing, and I haven't received a final response, the caller's phone 
>has to send a CANCEL request. When the proxy server receives the CANCEL, it 
>replies with a 487 "Request cancelled". SER does this before forwarding the 
>CANCEL to the callee's phone. These 487 response generated by SER makes the 
>INVITE client transaction of the caller finish. When the INVITE server 
>transaction finishes in the callee's phone, it sends another 487 response, 
>which is forwarded by SER, but the caller's transaction is already 
>finished, so it doesn't send the corresponding ACK.
>
>	I would like to know how to solve this problem, since SER should wait for 
>the callee's phone to send the 487 and then forward this response to the 
>caller's phone.
>
>	Best regards,
>
>	Esteban.
>
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