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<p>Hello,</p>
<p>indeed, the Record-Route address must be local to the server
adding it, asking to retrieve the subsequent requests within the
same dialog.</p>
<p>Adding the address in Record-Route of other node in the network
doesn't make much sense, especially when there is no relation
between them.</p>
<p>I have seen SIP stacks adding Route header with the IP of the
outbound proxy for initial requests, which is also disputable in
terms of how valid it is, but at least is for the current request
sent anyhow to that hope, not requesting a node to send traffic to
another node.</p>
<p>Likely a bug or misconfiguration in the SBC.<br>
</p>
<p>Cheers,<br>
Daniel<br>
</p>
<br>
<div class="moz-cite-prefix">On 17/01/2017 19:40, Andres wrote:<br>
</div>
<blockquote cite="mid:587E6525.7030501@telesip.net" type="cite">
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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">--
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<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla
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