Hi , we have a set up where we are using a SIP proxy( OpenSIPS) to handle a 302
redirect locally but it doesn't seem to be working with voip providers here is
the call flow. Is it legal, if so we'll bother you with a SIP trace. The 302 is
handled locally by the OpenSIPS proxy and generates a new call leg but can't
establish a dialog with Sipgate or Voipfone
INVITE INVITE
VoipFone Server ---------> Proxy ------------> UAC1
Trying
VoipFone Server <-------- Proxy
180 Ring
180 Ring <------------- UAC1
<------ Proxy 302 Redir
<-------------- UAC1
INVITE
---------------> UAC2
180 Ring
<----------------UAC2
180 Ring
VoipFone Server <----------
CANCEL
------------> 200 OK
200 OK <--------------- UAC2
<------------
THe VoipFone server sends a cancel straight after the 180 ring, Sipgate
doesn't do this however it never sends an ACK for the 200K, anyway both
don't like what we are doing.
We need to do the 302 redirect locally on our proxy as not all Voip providers
support it so we can't let it go all the way back. Hope its clear what we are
trying to, and is there any way forward.
Here is the code in our opensips.cfg file
failure_route[1] {
if (t_was_cancelled()) {
exit;
}
get_redirects("3:1");
t_relay();
}
Thanks
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