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

[Carlos Oliva]

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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