If I understand you the IPPBX is sitting in the middle of the call,
between the two endpoints and wants a way to verify that the two
endpoints continue to function. Right?
If the IPPBX is a B2BUA then it may, at any time after the call is
established, send a request to either of the ends. This could be
OPTIONS, reINVITE, UPDATE, ...
If the IPPBX is a *proxy* then it can't initiate messages within the
INVITE dialog. In that case the proxy can use Session Timer (RFC 4028),
but that does require the cooperation of at least one of the endpoints.
Another possibility is for the IPPBX to subscribe to the dialog event
package of the endpoints (RFC 4235) to monitor what they are doing.
Paul
Amit Lobo wrote:
> Dear All,
>
> Is there any SIP method for a SIP server to know that endpoints are active
> with a call?Specially when
> RTP is running between the endpoints and not through the SIP server.
> My working example is IPPBX(SIP server) connects call between two
> endpoints,and for RTP session it sends
> re-Invite by making RTP pass between endpoints.At this point time,is there
> any SIP method for IPPBX to know
> the call status....
>
>
> I am looking for a simple solution which can be implemented in short time.
>
> Thanks for you help in advance
>
> Amit
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>
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