17 Jan
2004
17 Jan
'04
8:18 p.m.
At 08:00 PM 1/17/2004, Arnd Vehling wrote:
Hi,
Daniel-Constantin Mierla wrote:
SER does not manage buddy lists or so. This is not related to session initiation protocol and I am not aware of any SIP client supporting such extension.
Just curious:
Is there any way to find out (using SIP protocol) if a certain SIP-Contact is registered (at a specified server?) _without_ sending an INVITE to the sip contact?
that's what the asynchronous-based SUBSCRIBE-NOTIFY presence is good for.] not many UAs implement it though, so you may instead try polling the UAs. OPTIONS would be a better choice than INVITE since it does not cause the other party to ring. Nevertheless, you are not really sure who responds to the OPTIONS -- it may be voicemail too.
-jiri