[OpenSIPS-Users] sip related question: via and contact headers with 0.0.0.0

[Carlos Oliva]

Thank you very much for your response Bogdan. Probably is a bug in
Grandstream Firmware.

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.

Thanks for your confirmation.

Thanks and regards,

Carlos Oliva


2017-07-04 18:21 GMT+02:00 Bogdan-Andrei Iancu <bogdan at opensips.org>:

> Hi Carlos,
>
> 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.
>
> 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.
>
> Shortly, I'm not aware of any legitimate case when an UAC should send
> 0.0.0.0 in VIA or Contact.
>
> Regards,
>
> Bogdan-Andrei Iancu
>   OpenSIPS Founder and Developer
>   http://www.opensips-solutions.com
>
> OpenSIPS Bootcamp 2017, Houston, US
>   http://opensips.org/training/OpenSIPS_Bootcamp_2017.html
>
> On 07/04/2017 01:44 PM, Carlos Oliva wrote:
>
> Hi List:
>
> This question is SIP related, I'm writing to the list just in case any SIP
> expert can help.
>
> 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.
>
> As far as I know this is not right, I can not see any similar in RFCs.
>
> It happens mainly with Grandstream phones, but I saw this with 3CX
> softphones the last week.
>
> The headers look like:
>
> Via: SIP/2.0/TLS 0.0.0.0:30201;branch=z9hG4bK1519166325;rport;alias
>
> Contact: <sip:MASKED-USERNAME at 0.0.0.0:30201;transport=tls>;reg-id=1;
> +sip.instance="<urn:uuid:00000000-0000-1000-8000-000B828E658A>"
>
> The issue happens using UDP and TLS protocol, I can discard a firewall ALG
>
> The expires header is at configured value (1200 or 120 seconds) and all
> other headers (from, to, callId, ... ) seems to be OK
>
> 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?
>
> Thanks for your help,
>
> Carlos Oliva
>
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