> For those of you who know H.323,
>
> Is there an equivalent of LRQ and GRQs (from H.323) in
> the SIP world ? If so, what would they be ?
Not exactly.
You can probably use OPTIONS as a replacement for LRQ.
If you receive a 200, the end user to which OPTIONS was sent
exists. You can *not*, however, get the current location of the
user, if the intermediate server proxies the message instead of
redirecting.
In SIP there is no need for GRQ;
for the SIP URL's host portion gives the address
to be contacted for making a call.
In H.323, you can not find the server address just by looking at
the destination address (URL).
multicast REGISTER is probably closest to GRQ/RRQ sequence.
Kundan
>
>
> --Satish.
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