[SIPForum-discussion] In which scenario Proxy will generate CANCEL ?

praveena ss ss.praveena at gmail.com
Thu Jun 17 20:28:04 UTC 2010

Hi Seshagiri,
   if u don't receive the call at UAS side, i mean if u don't send the 200
OK from UAS for the invite for long time, UAC will send the CANCEL and it
will be forwarded to UAS through the proxy server. Here in your scenario
proxy won't send any request or responses by itself to either UAC/S but it
only forwards the request/responses.

Dear sipform folks correct me if i am wrong,


On Thu, Jun 17, 2010 at 1:05 PM, seshagiri <seshgirik at gmail.com> wrote:

> Hi All
>  I came across a scenario to test CANCEL which should be generated by
> Proxy.
>  In the following scenarios, which scenario is valid?
>  1 UAC sends INVITE to Proxy, proxy forwards the request to UAS.
>  Now UAS responds with 180 ringing only  but no final response , so in
> this case *Proxy sends CANCEL to UAS  or which response ?*
>  Now the proxy sends 408 or 480 to UAC ?
>  Or in the *above scenario is valid only for Forking* *scenario only*,
> where Proxy tries to multiple locations?
> I am confused about the functionality.
>  Pl give your valuable suggestions.
>  Regards
> Sesh
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