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<tt>Hi Carlos,<br>
<br>
I do not claim to be SIP expert, but it has no sense in my
opinion. Even more, I haven't seen anything like that. So I would
say it is a bug. <br>
<br>
My first reaction was to point to an ALG (that's something I came
across), but if you do TLS this is out of discussion.<br>
<br>
Shortly, I'm not aware of any legitimate case when an UAC should
send 0.0.0.0 in VIA or Contact. <br>
<br>
Regards,<br>
</tt>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a>
OpenSIPS Bootcamp 2017, Houston, US
<a class="moz-txt-link-freetext" href="http://opensips.org/training/OpenSIPS_Bootcamp_2017.html">http://opensips.org/training/OpenSIPS_Bootcamp_2017.html</a>
</pre>
<div class="moz-cite-prefix">On 07/04/2017 01:44 PM, Carlos Oliva
wrote:<br>
</div>
<blockquote
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<div>Hi List:<br>
<br>
</div>
This question is SIP related, I'm writing to the list just
in case any SIP expert can help.<br>
<br>
</div>
I'm facing random cases where some phones send to my
OpenSips proxy a REGISTER with VIA and CONTACT host part
with 0.0.0.0 address.<br>
<br>
</div>
As far as I know this is not right, I can not see any similar
in RFCs.<br>
<br>
</div>
It happens mainly with Grandstream phones, but I saw this with
3CX softphones the last week.<br>
<div>
<div><br>
</div>
<div>The headers look like:<br>
</div>
<div><br>
Via: SIP/2.0/TLS
0.0.0.0:30201;branch=z9hG4bK1519166325;rport;alias
<br>
<br>
Contact:
<a class="moz-txt-link-rfc2396E" href="sip:MASKED-USERNAME@0.0.0.0:30201;transport=tls"><sip:MASKED-USERNAME@0.0.0.0:30201;transport=tls></a>;reg-id=1;+sip.instance="<urn:uuid:00000000-0000-1000-8000-000B828E658A>"<br>
<br>
</div>
<div>The issue happens using UDP and TLS protocol, I can
discard a firewall ALG<br>
<br>
</div>
<div>The expires header is at configured value (1200 or 120
seconds) and all other headers (from, to, callId, ... )
seems to be OK<br>
</div>
<div><br>
</div>
<div>My questions is: This is right according RFC or is a bug
on those phones? Maybe is right and I'm doing something
wrong in my OpenSips config?<br>
<br>
</div>
<div>Thanks for your help,<br>
<br>
</div>
<div>Carlos Oliva<br>
</div>
<br>
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