17 Jan
2004
17 Jan
'04
10:18 p.m.
At 08:00 PM 1/17/2004, Arnd Vehling wrote:
Hi,
Daniel-Constantin Mierla wrote:
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
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?