[OpenSIPS-Users] Call Forking using openSIPS

[Bogdan-Andrei Iancu]

Hi,

Code Warrior wrote:
> Hi,
>
> I want to implement call forking in a scenario where multiple UAs 
> (using Linphone) register
> with the same SIP URI (say "user1 at abc.com <mailto:user1 at abc.com>"). 
> Going by the SIP protocol, each of these
> UAs shall use their own IP address in the Contact header while sending 
> the REGISTER request.
right
>
> I'm using openSIPS 1.5.2 (no-tls) for the proxy/registrar functions. 
> I'm successfully able to register
> multiple UAs with same SIP URI (user1 at abc.com <mailto:user1 at abc.com>). 
> Problem comes when i make a call from some
> other UA (user2 at abc.com <mailto:user2 at abc.com>, also registered with 
> the same openSIPS proxy) and route the call via proxy.
> Note that the outgoing INVITE does not have a Route header (i'm using 
> Linphone for all UAs).
>
> On receiving the call, openSIPS fails to route the message. It is 
> unable to resolve "abc.com <http://abc.com>" domain.
> Is there something that i'm missing in openSIPS configuration. I 
> thought if the registration of the UA is successful,
> openSIPS would simply dip into its registration DB, get the contact 
> details and route the msg forward.
> Perhaps, it is trying to do a DNS SRV/NAPTR lookup for "abc.com 
> <http://abc.com>" and eventually fails. Looks like i need to
> define "abc.com <http://abc.com>" as the local domain somewhere in 
> openSIPS cfg. Any help in this regard would be appreciated.
yes, you have to instruct opensips that abc.com is a local domain.

To do so:
   1) if you do not use domain module, add in your cfg:
             alias=abc.com

    2) if you use domain module, add the domain name into the "domain" 
table and do a "domain_reload"

Regards,
Bogdan
>
> Here is a pictorial view of what is to be achieved:
>
> Registration
> ------------------
> UA1 (user1 at abc.com <mailto:user1 at abc.com>, 192.168.5.14) -----> openSIPS
> UA2 (user1 at abc.com <mailto:user1 at abc.com>, 192.168.5.38) -----> openSIPS
> UA3 (user2 at abc.com <mailto:user2 at abc.com>, 192.168.5.25) -----> openSIPS
>
> Call Forking
> -----------------
>                                                                                                   
> | ----------> UA1
> UA3 (calls user1 at abc.com <mailto:user1 at abc.com>)  ---> openSIPS (forks 
> to UA1, UA2) ---  |
>                                                                       
>                             |-----------> UA2
>
> /csj
> ------------------------------------------------------------------------
>
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