Hello all!
I need to find a way to use asterisk and a forking proxy to fork INVITE messages.
Does anybody know a free SIP Proxy that can act as such a proxy? Can Asterisk act as one? Can SER or OpenSER do it??
Thanks in advance,
Amanda
Hi,
OpenSER (now Kamailio or OpenSIPs) can act as a SIP proxy.
Asterisk is not a proxy. It is an SIP Back to Back User Agent or just an User Agent - depending how you configure it.
Asterisk can actually FORK invite messages in a sense.
Using the Dial() command with multiple SIP destinations you can achieve forking the asterisk way.
Dial(SIP/exten1&SIP/exten2,30)
It would be a SIP B2BUA in this scenario, but it would achieve the same result.
Considering this case in which we use “Dial” to implement forking, what would be Asterisk´s behavior??
A SIP proxy should cancel all requests it sent once it receives the first 200 OK, do you now if Asterisk would behave like this???
Yes, I believe that asterisk sends a CANCEL to all but the first one to answer. I would do a SIP trace just to ensure… but I believe that it properly supports this behavior.