asterisk users - Apr 2016 - Using Asterisk to route call via an outbound proxy

Hello,

I want to use Asterisk to use Kamailio as an outbound proxy for routing
calls to remote SIP end points, one option could be to use a default peer,
but in my case, my outbound proxy can change
based on the remote end point, so this option doesn't work.
And another problem is that I don't know how to configure Asterisk to
prepare the Request-URI
based on the remote end point and not based on the outbound proxy address?

What is the best way to do it?

Thanks,
Nitesh
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Nitesh Bansal wrote:
> Hello,
>
> I want to use Asterisk to use Kamailio as an outbound proxy for routing
> calls to remote SIP end points, one option could be to use a default
> peer, but in my case, my outbound proxy can change
> based on the remote end point, so this option doesn't work.
> And another problem is that I don't know how to configure Asterisk to
> prepare the Request-URI
> based on the remote end point and not based on the outbound proxy address?
>
> What is the best way to do it?
You'll have to be specific with the channel driver in use. Speaking from 
chan_pjsip it does not have a mechanism to set the outbound proxy on a 
per-call basis, it's strictly controlled by the endpoint. You'd need 
multiple or construct endpoints dynamically (for example using the ARI 
push configuration). As for not rewriting the request URI you need to 
use loose routing by specifying ;lr in the outbound proxy URI.

Example:

sip:example.com;lr

If used in a configuration file:

sip:example.com\;lr

The '\' is so the configuration parser does not treat it as a comment.

Cheers,

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org

I'm using chan_sip, I experimented with adding a 'Route' header in
the
originate command and used the Dial command like 'SIP/peer/exten', but
problem
is that Request-URI isn't populated correctly.
I'm using Asterisk 13.

Thanks,
Nitesh

On Wed, Apr 13, 2016 at 10:09 PM, Joshua Colp <jcolp at digium.com> wrote:
> Nitesh Bansal wrote:
>
>> Hello,
>>
>> I want to use Asterisk to use Kamailio as an outbound proxy for routing
>> calls to remote SIP end points, one option could be to use a default
>> peer, but in my case, my outbound proxy can change
>> based on the remote end point, so this option doesn't work.
>> And another problem is that I don't know how to configure Asterisk
to
>> prepare the Request-URI
>> based on the remote end point and not based on the outbound proxy
address?
>>
>> What is the best way to do it?
>>
>
> You'll have to be specific with the channel driver in use. Speaking
from
> chan_pjsip it does not have a mechanism to set the outbound proxy on a
> per-call basis, it's strictly controlled by the endpoint. You'd
need
> multiple or construct endpoints dynamically (for example using the ARI push
> configuration). As for not rewriting the request URI you need to use loose
> routing by specifying ;lr in the outbound proxy URI.
>
> Example:
>
> sip:example.com;lr
>
> If used in a configuration file:
>
> sip:example.com\;lr
>
> The '\' is so the configuration parser does not treat it as a
comment.
>
> Cheers,
>
> --
> Joshua Colp
> Digium, Inc. | Senior Software Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - US
> Check us out at: www.digium.com & www.asterisk.org
>
> --
> _____________________________________________________________________
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