[EMAIL PROTECTED] wrote:
> Hi,
>
> Is there a way for a SIP UA to know whether another SIP UA is available
> or
> not, without establishing a session?
> I heard that one can use an OPTIONS method for this. But what if the SIP
> UA
> hasn't implemented it and just drops the message without responding?
This alone shows that the UA is available. If it generates a 405 since
it doesn't understand OPTIONS (however all bis compliant UAs have to
support it), the UAC knows that the UA is available but doesn't support
OPTIONS. A 480 would tell you its not registered.
-Jonathan R.
--
Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Avenue
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PH: (973) 952-5000
http://www.dynamicsoft.com
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