[OpenSIPS-Users] How to implement a SIP Trunk in between two SIP servers.

[Bogdan-Andrei Iancu]

Hi Steven,

To do that, you need to add in opensips some routing to 1) recognize the 
numbers that needs to be sent to CUCM and 2)route that calls to CUCM.

For script logic it sounds like : if you receive a new call (initial 
INVITE) for your local domain, check the URI and divert. If you look at 
the default config file, there is comment "# requests for my domain" -> 
from that point further you have only initial INVITEs for your local 
domain, so you can add after:

    # all numbers starting with 55 are to be sent to CUCM
    if ($rU =~ "^55[0-9]+$") {
          # replace the domain part of RURI to point to CUCM
          rewritehostport("CUCM_IP:CUCM_PORT");
          # route the call out based on RURI
          route(1);
    }


For the other way around, you have to put a similar logic in CUCM, like 
to divert all calls starting with "12" to opensips - and replace the 
domain on RURI with the IP/domain of opensips.

Regards,
Bogdan

steven chew wrote:
> Hi Bogdan,
>
> Thank you very much for your reply.
>
> I have an Opensips Server and a Cisco Unified Communication Manager 
> (CUCM).
>
> If I want to make calls from Opensips Server to CUCM and CUCM to 
> Opensips Server.
>
> For example:
> 1) If I dial an extension number "5566" from a SIP Phone "12345" under 
> Opensips Server, it will try to call to a Cisco IP Phone 
> "5566" from CUCM through a SIP Trunk.
> 2) If I dial an extension number "12345" from a Cisco IP 
> Phone "5566" under CUCM, it will try to call to a SIP Phone "12345" 
> under Opensips Server through a SIP Trunk.
>
> Can you give some instructions how to configure the above scenario for 
> dialing extension numbers?
>
> Thanks
> Steven, 
>
> On 6 January 2011 21:31, Bogdan-Andrei Iancu <bogdan at voice-system.ro 
> <mailto:bogdan at voice-system.ro>> wrote:
>
>     Hi Steven,
>
>     If you use the opensips default script, your opensips will accept
>     calls from any other external SIP entities (call targeting a local
>     opensips subscriber).
>
>     If you want to configure your opensips to accept foreign calls
>     only form a specific IP address, you can use the permission
>     module, with address table to implement IP-based authentication.
>
>     Best regards,
>     Bogdan
>
>     steven chew wrote:
>
>         Hi everyone,
>
>         I am a newbie with SIP-Trunk in OpenSips.
>         I have a Cisco Communication Unified Manager and a OpenSips
>         Server running in two different Virtual Machines.
>
>         I would like to have a SIP trunk in between them "Cisco
>         Communication Unified Manager and OpenSips Server".
>         Therefore, I can make a call from OpenSips Server's SIP
>         Clients to Cisco IP Phone.
>         What should I need to add into opensips.cfg configuration file?
>
>         I hope you can give some simple examples how to do it.
>         I look forward to hearing from your advise asap.
>
>         Thanks
>         Regards,
>         -Steven.
>
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>
>
>     -- 
>     Bogdan-Andrei Iancu
>     OpenSIPS Event - expo, conf, social, bootcamp
>     2 - 4 February 2011, ITExpo, Miami,  USA
>     www.voice-system.ro <http://www.voice-system.ro>
>
>
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-- 
Bogdan-Andrei Iancu
OpenSIPS Event - expo, conf, social, bootcamp
2 - 4 February 2011, ITExpo, Miami,  USA
www.voice-system.ro