[Freeswitch-users] Two Users Registered ..But calls only going one way

[Steven Ayre]

See the contents of the Contact header in A's REGISTER messages. They tell
FreeSWITCH where to send the call to.

NAT can confuse matters when picking the correct value though. It needs to
be the external IP & port of the NAT router that the internal IP/port of
the SIP messages are mapped to. Sometimes the phone will put the internal
details instead which aren't routable externally. Sometimes it can detect
it correctly (eg via STUN). If it can't some routers will contain a SIP ALG
that will rewrite the header for a phone sending the internal ip/port to
the external ip/port, but sometimes this can cause more problems than it
solves if it doesn't do this correctly and it can't modify the packet if
you're using TLS.

On top of that that internal to external port mapping will expire on that
NAT router if you don't re-REGISTER frequently enough so that could stop
the INVITE getting through even if you're sending to the correct place.

If you're having issues like that getting the SIP packets through then it's
likely

If you can't fix it on the phone/router then you can also look at the NDLB
(no device left behind) options. For example there's one that'll use the
address the REGISTER is received from instead of the Contact header. This
differs from how SIP is supposed to work but works in most cases (usually a
phone will ask you to call it directly not via a proxy or route you
elsewhere).


On 11 February 2016 at 09:46, David Wafula <davidwaf at gmail.com> wrote:

> Hi all,
> I have two users who registered in the same domain: user A and B.
> A can call B just fine. When B tries to call A, there is silence (no
> ringback)..then after sometime the call goes into voice mail. A never
> receives the call.  Please see the call trace here:
>
>
> http://pastebin.com/gWrrS4zw
>
> Am not sure what is causing it.
>
> Regards
>
> --
> David W
>
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