Well, I am not sure whether this discussion belongs to here or to the
dev list, or maybe somewhere else but I still press on. :-)


"You may want to check out the design document. Please download the
source code from svn and look at sipXbridge/doc/design.tar.gz""

Thanks for the pointer, it is a very useful material. I am looking at
the outbound-blind-transfer-to-pbx scenario.

First, I found strange messages like this:

Time: 2009-01-03T19:24:36.701000Z
Frame: 31 /tmp/trace.Risq9235/_.sipxbridge.trace.xml:968
Source: sipxtest.example.local-sipXBridge
Dest: 81.144.230.5:5060

INVITE sip:[email protected]:5060;transport=udp SIP/2.0
CSeq: 2 INVITE
Call-ID:
94befed0-c0a805ed-13c4-2872c-32686d2b-28...@sipxtest.example.local.0
From: "user4" <sip:[email protected]>;tag=8002033480187804211
To: <sip:[email protected]>;tag=SDl7pu599-621570258
Max-Forwards: 70
Allow: INVITE,BYE,ACK,CANCEL,OPTIONS
Via: SIP/2.0/UDP
192.168.5.75:5080;branch=z9hG4bK46dc16e777498a3b9562fe4e92073abb
Contact: <sip:[email protected]:5080;transport=udp>
Accept: application/sdp
Content-Length: 0

What are these for? These seem to be proxied "hold" re-INVITE requests
from the Nortel 6812 desk phone but where is the body.

The second, more interesting question for me, what do the parties in
question hear when the transfer is in progress. My understanding is the
both the source and target1 call legs are established, therefore 183 or
180 messages without SDP cannot be proxied in any way. Therefore if the
REFER target is a deskphone (that often does not produce early media for
ringing), no party in the call (Source, target1) will hear ringing while
the transfer progresses.

Am I missing something?

Regards,
Gabor

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