<div dir="ltr"><div><div><div><div>Thank you very much for your response <span class="" style="" id=":lqv.1" tabindex="-1">Bogdan</span>. Probably is a bug in <span class="" style="" id=":lqv.2" tabindex="-1">Grandstream</span> Firmware.<br><br></div>I will work with the manufacturer about this, but I was not completely sure if there was a corner case where this could be possible.<br><br></div>Thanks for your confirmation.<br><br></div>Thanks and regards,<br><br></div>Carlos <span class="" style="" id=":lqv.3" tabindex="-1">Oliva</span><br><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"></div></div></div></div></div>
<br><div class="gmail_quote">2017-07-04 18:21 GMT+02:00 <span class="" style="" id=":lqv.4" tabindex="-1">Bogdan</span>-Andrei <span class="" style="" id=":lqv.5" tabindex="-1">Iancu</span> <span dir="ltr"><<a href="mailto:bogdan@opensips.org" target="_blank"><span class="" style="" id=":lqv.6" tabindex="-1">bogdan</span>@<span class="" style="" id=":lqv.7" tabindex="-1">opensips</span>.org</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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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="m_3659810862353184668moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="m_3659810862353184668moz-txt-link-freetext" href="http://www.opensips-solutions.com" target="_blank">http://www.opensips-solutions.<wbr>com</a>
OpenSIPS Bootcamp 2017, Houston, US
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</pre><div><div class="h5">
<div class="m_3659810862353184668moz-cite-prefix">On 07/04/2017 01:44 PM, Carlos Oliva
wrote:<br>
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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=<wbr>z9hG4bK1519166325;rport;alias
<br>
<br>
Contact:
<a class="m_3659810862353184668moz-txt-link-rfc2396E"><sip:MASKED-USERNAME@0.0.0.0:<wbr>30201;transport=tls></a>;reg-id=1;<wbr>+sip.instance="<urn:uuid:<wbr>00000000-0000-1000-8000-<wbr>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>
<div><br>
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