Can PJSIP help with this requirement?

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I have a very basic SIP client application, which can make and receive phone 
calls, and that's about it.  Regard it as a pretty dumb softphone.  
Unfortunately I cannot change it for a smarter one.

This client is talking to a completely capable SIP server (PBX) which can do 
all the standard PBX stuff like putting calls on hold, transferring them, 
conferencing, etc.

The problem is that the simple SIP client cannot itself tell the server to do 
any of these things - it can send an INVITE to place a call, and it can 
REGISTER and then accept an INVITE to receive a call, but it doesn't know how 
to send any other commands to the server to "manage" calls once they're in 
progress.  The simplest example is putting a call on hold and then resuming it 

I'm looking for something which I can place in the network path between the 
client and the server, which can send these call control commands on to the 
server, so that it can then put calls on hold, transfer them, etc.

I'm assuming this "thing" needs to sit in the network path, so that it sees 
the INVITEs and OKs and is then aware of the Call-IDs and sequence numbers, 
etc, and can therefore present the correct call reference to the SIP server 
when it wants to say "please put this one on hold".  I have full access to the 
SIP credentials used to authenticate the client to the server.

I had thought that Kamailio might be what I was looking for, but I've asked on 
their mailing list and people are telling me that it isn't, and have suggested 
PJSIP as a potential solution.

Is that possible?  Could I somehow use PJSIP to generate and send commands to 
a SIP server in order to control calls which have been placed either from or 
to this simple SIP client softphone application?

If anyone thinks there is another, perhaps better, way of achieving this, then 
I'm quite open to alternative solutions (as I say, I was initially thinking 
that Kamailio might be the way forward), so anything that shows me how such 
a thing might be achieved, with any tool at all, would be very welcome.



Anyone that's normal doesn't really achieve much.

 - Mark Blair, Australian rocket engineer

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