[asterisk-users] Wierd RTP issue

[Carlos Chavez]

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On 11/24/12 4:07 PM, Richard Kenner wrote:
> I have a peculiar RTP issue.  I'm experimenting with Jitsi as a
> softphone on one of my desktop Windows machines.  That machine can
> either be connected to Asterisk via an VPN connection (with a
> static IP address) or not (via NAT). When it's connected via NAT,
> all is OK.
> 
> When it's connected with VPN, the following occurs:
> 
> The voice path inbound to Jitsi works fine when Jitsi originates
> the call, no matter what it's calling.
> 
> The voice path inbound to Jitsi works fine when it's called from
> another SIP device.
> 
> The voice path inbound to Jitsi is silent when it's called from
> something on the other side of a PRI via DAHDI.
> 
> I've run Wireshark on my desktop and see the RTP packets coming at
> the same rate and protocol (g711) in all the cases and "sip set
> debug peer xyz" doesn't shed any light on the situation (the SDP
> data looks similar in the working and non-worknig cases).
> 
> Does anybody have any ideas what to look at next?
> 

The most common problem is that the VPN network is not declared as a
localnet on Asterisk so it assumes that it has to do NAT and so
replaces the external IP for communication.  Make sure that your VPN
segment is in sip.conf.

- -- 
Telecomunicaciones Abiertas de México S.A. de C.V.
Carlos Chávez Prats
Director de Tecnología
+52-55-91169161 ext 2001
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