[SR-Users] One way audio on calls from pstn

[dotnetdub]

On 1 July 2010 21:53, Dmitri Korotkov <dmitri.korotkov at festart.ee> wrote:

> Hello,
>
> I have kamailio installation WITH_PSTN, WITH_NAT and rtpproxy.
> Using following scenario:
> [kamailio]<-sip trunk ->[asterisk gw] <->sip trunk <-> [PSTN provider]
>
> All kamailio sip subscribers are behind nat in different networks.
>
> 1. OK. Local kamailio users can call one to other even they are on
> different networks behind nat.
> 2. OK. Outgoing calls from kamailio users to PSTN work also very well.
> 3. Not OK.  Incoming from PSTN side calls have only one way audio.
>
> I tcpdump'ed kamailio box and found, that pstn provider sends RTP packets
> to kamailio IP in case of answered call.
>
> I guess that rtpproxy is not active in case of pstn call.  Is it true ?
>
> I am using more less default kamailio config
>
> Could you please suggest solution ?
>
> BR,
> Dmitri
>
>

Hi Dmitri,

Check out the nathelper module.

Regards,
Brian
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