[asterisk-users] On SIP INVITE answering to IP:port found in Contact: header.

Matthew J. Roth mroth at imminc.com
Tue Apr 16 19:01:10 CDT 2013

Joshua Colp wrote:
> If you set nat=no for that specific peer it should work as you need. 
> 'rport' is forced on these days which works for most situations, except 
> with some platforms and Cisco phones. >_>


That sounds much easier than what I came up with, so I'd recommend to Markus
that he try your suggestion first.

If you have a moment, please take a look at my response and let me know if my
understanding of the Contact and Via headers was correct.  If it was, is the
'nat=no' solution just a way to workaround the provider's RFC-noncompliant

Thank you,

Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer

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