[Serusers] Multiple Invites

[ser list]

Hi,

I am new to Ser, and hence I need some help on the following:

1. Someone makes a PSTN call and my cisco router forwards the call to
my SER sip server.
By default, my router will forward it to an account on SER, such as 1000.

2. Upon receiving the request, SER should make ALL registered phones
in the same domain ring.  When someone  picks up the phone, other
phones should stop ringing.


I am able to implement point 1, but how can I make all phones ring at
the same instance?

I am thinking of doing something like the following for INVITES :

if(uri =~"sip:1002 at serproxy.com"){
  rewriteuri("sip:1003 at serproxy.com");
  forward(uri:host, uri:port);
  rewriteuri("sip:1004 at serproxy.com");
  forward(uri:host, uri:port);
}

Can someone pls advise me on the best approach?

Regards,
zan