[OpenSIPS-Users] What to do when one user agent leaves suddenly?

[Bogdan-Andrei Iancu]

Hi Chen-Che,

The detection of such a ghost call be done by the remaining UAC (in the 
call) - it will have a media timeout event (not receiving any media from 
the other party), so it should send a BYE.

Now, relying on the UAC to detect and hang up may not be satisfactory - 
some do the work, some don't.

You can also do the detection on the proxy:
     1) based on signaling, if you do in-dialog pinging (OPTIONS) - this 
is a light way of doing it, but not all UAC properly answer to in-dialig 
pings - here you can use the "pP" flags from dialog creation.
     2) based on a timeout from media relay - rtpproxy can detect when 
there is no more media for an ongoing call and it generates a timeout 
event back to opensips -> opensips, via dialog module, will send BYE in 
both directions, terminating the call at signaling level.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com


On 04/09/2013 05:26 AM, microx wrote:
> Hi all,
>
> I have one issue that may not be related to OpenSIPS. Suppose two user
> agents are having a video call with each other (RTP proxy is serving as
> packet relay). One of the two user agents suddenly leaves without sending a
> BYE request owing to some factors (such as network disconnection). In such a
> case, should a SIP server terminate the dialog by sending a BYE request if
> the other user agent does not hang up the video call on his/her own? Or a
> SIP server does not need to do anything and just waits for the other user
> agent to end the call on his/her own?
>
> My two questions about this issue are
> 1) Any SIP-related RFC mentions anything about this issue?
> 2) If the SIP server has to terminate the dialog, what mechanism is
> appropriate? I know that create_dialog("Pp")/create_dialog("B") may be
> helpful for this issue, but I am looking for a better solution.
>
> Any suggestion or comment is very welcome. Many thanks.
>
> Best wishes,
> Chen-Che
>
>
>
> --
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>
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