[asterisk-users] pjsip: How is asterisk choosing the IP address to put in the Contact header?

[George Joseph]

On Fri, Nov 29, 2019 at 8:30 AM Benoit Panizzon <benoit.panizzon at imp.ch>
wrote:

> Short update...
>
> After some more research I found:
>
> https://community.asterisk.org/t/box-with-2-interfaces-wrong-one-chosen-in-contact-header/74705/3
>
> And some more similar ones describing the same problem with chan_sip
> and pjsip.
>
> I attempted to set: external_signaling_address on my transports. Also
> trying to trick them there could be NAT (there is none) by setting.
> local_net=192.168.99.0/24
>
> Asterisk is still sending the wrong IP Address in the Contact header of
> 183 or 200 messages.
>
> Can anyone confirm this is a bug?
>

There's been a lot of work in this area since 13.18.  Without seeing packet
captures of the incoming request and the response and seeing the exact
configuration of the endpoints and transports it's hard to say what's going
on.  One thing you can try is setting "symmetric_transport=yes" on the two
transports.  That should ensure that the responses go out the same
transport as the one that received the request.  That, in turn, should
change the contact address accordingly.




>
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>
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-- 
George Joseph
Asterisk Software Developer
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Check us out at www.sangoma.com and www.asterisk.org
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