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Hi,<br>
<br>
I am troubleshooting some strange call setup problems using an
Edgewater Networks SBC. A couple of Polycom phones sit behind the
SBC and they connect to a SIP Server in the cloud. The SBC is in
passthrough mode.<br>
<br>
What I see that I am not sure about is:<br>
INVITE from SIP Server to SBC IP (no Record-Route header...so far no
surprise here)<br>
INVITE from SBC to Phone (Record-Route header inserted by SBC but
with the IP of the SIP Server)<br>
<br>
I do not think the SBC is supposed to add a Record-Route header with
the IP of the remote SIP Server. I think It should only be allowed
to add Record-Route headers with its own IP. Does that sound right?<br>
<br>
The RFC lists the usage as:<br>
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<br>
"20.30 Record-Route<br>
<br>
The Record-Route header field is inserted by proxies in a request
to<br>
force future requests in the dialog to be routed through the
proxy."<br>
<br>
It says nothing about being able to arbitrarily force future
requests to go through a remote IP.<br>
<br>
Please advise.<br>
<br>
Thanks,<br>
<pre class="moz-signature" cols="72">--
Technical Support
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