I am not sure if its the issue on my client end as CSIPSImple is not sendin the PRACK that is expected by the server or the rtp ports are not opened.

I guess the ports are opened as I can hear two way voice.

But the following issues remain:

1. I cannot receive a call on the SIP number

2. I dont get an indication on the caller (thru CSIPSimple) that a call has started as in it doesnt start the call timer

3. The call disconnects with an error after some time ..INternal Server Error.

Regards,

Rizwan Khan

On Mon, Dec 1, 2014 at 11:00 AM, Rizwan Khan <rizkhan@gmail.com> wrote:

Thanks for the help guys.

I used a stateless proxy and was able to register. Now I am able to make calls as well but there is an issue.

I receive multiple ringing but not receiving 200 ok after that. I keep on receiving the ringing messages. Although the call gets connected and I hear two way voice as well.

Also I am call through the sip number, but its not receiving any calls.

Any ideas?

Rizwan Khan

On Thu, Nov 27, 2014 at 9:04 PM, Daniel Tryba <daniel@pocos.nl> wrote:

On Thursday 27 November 2014 08:29:51 Rizwan Khan wrote:
> We want to use Kamailio as the pass-thru proxy in front of the SBC just to
> receive the request on a random port, and then forward the request to the
> SBC internally being on the same private network.
>
> What would be the best way to do it?

If it is the best is up to the experts, but a way to do is to check wheter the
source is the SBC or not. If the message is from the SBC just handle it
statefully (t_relay), if it isn't from the SBC set the requested domain to the
ipaddr of the SBC (10.1.2.3) and process stateful. You could use the received
port instead if external clients only communicate on the special port
($Rp!=6334)

kamailio.cfg:

#...
port=5060
port=6334
#...

request_route {
#...

if($si!="10.1.2.3")
{
$rd="10.1.2.3";
}

route(RELAY);

}

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