Hi list, what i need to know is if there is a way with SIP protocol to
query a user to know his status.
Let me explain:
I am implementing a SIP proxy, using opensips, which act as a forking
server. Something like shown below:
E1 SIP Fork |-------->
PBX1
PSTN----->Mediant 1000------->OpenSIPS--------|
|--------> PBX2
Could happen that requested users, belonging to PBX 1 and 2 can already be
on the phone.
So my idea is, before forwarding the original request, query with some SIP
message the 2 users. If at least one result
on the phone ( replying, for instance, with code 486 or something else )
opensips learn about it and then it replies to original calling
with busy tone.
Is that possible?
So what I need to know as said before, is if SIP protocol has some
mechanism to send a message and get reply, without making any reaction by
users
blonging to PBX 1 and 2. Just reply to my "sip control message".
Regards.
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