As others have noted, session timer can be used for this, and OPTIONS is
a bad choice.
But note that session timer is primarily for the benefit of
dialog-stateful *proxies*, because they have no way to test the dialog
on their own. All session timer does is schedule a time when the dialog
should be tested, and who should initiate the test. The test itself is
an ordinary in-dialog message (INVITE or UPDATE). Either of the UAs in
the dialog can do that on their own any time they have doubt that the
session is still active. (E.g., when a UA notices that it hasn't
received media for a long time it might decide to send a reINIVTE or
UPDATE to test the dialog.)
Thanks,
Paul
On 6/26/13 5:26 AM, ikuzar RABE wrote:
> Hi all,
>
> I'd like to know if there are SIP messages exchange to maintain the session
> between two UA (message such as "Hello, I'am still here" / "Hello, I'am
> still here too" while RTP conversation is established and lasts a longtime.
>
> The context:
> I have to differentiate an INVITE with a BYE which arrives one hour after
> an INVITE (so a conversation that lasts one hour) and an INVITE with no BYE
> ... (packet lost or another problem ...)
>
> Ikuzar
> _______________________________________________
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> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>
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