[Serusers] 408 to Caller UA when CANCEL to Callee

[Greger V. Teigre]

Tulika,
This is not a function of SER, but your ser.cfg file.  We have just released 
a new Getting Started document at onsip.org that you may use as a reference 
to identify why your ser.cfg causes a 408 to be sent.
g-)

Tulika Pradhan wrote:
> hi,
>
> i am facing the following situation.
>
> UA1 calls a user(UA2)  who does not answer. the control comes to
> failure_route where i try another UA (UA3). but as UA3 rings, SER
> sends 408 Request timeout to UA1 and call gets disconnected.
>
> this is the SIP message flow.
>
> UA1                     SER                      UA2
> UA3
> INVITE---------------->
>                               INVITE-------------->
>                                <----------------TRYING
>                                <----------------RINGING
> <------------------RINGING
>
>
>                              CANCEL-------------->
> <---------------------408
>
> INVITE---------------------------------------->
>                               <---------------------487
>                              ACK------------------->
>                                <-----------------------OK
>
> <-------------------------------------------TRYING
>
> <--------------------------------------------RINGING
>
> (but UA already has got the busy tone) and does not hear this ringing.
>
> if 408 was not sent to UA1, then the call could have been established.
>
> what is going wrong,
>
> regards,
>
> tulika
>
>
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