[OpenSIPS-Users] how to make a phone call to between two different domain sip server

Bogdan-Andrei Iancu bogdan at opensips.org
Mon Nov 3 07:26:14 CET 2014

Hi Michael,

In SIP, each SIP server does server a certain set of SIP domains 
(defined as FQDNs or IPs). Let's assume phone A registers with proxy A 
using domainA and phone B registers with proxy B using domainB.
To have a call from phone A to phone B, A must dial B at domainB - so when 
the call will land on proxy A, proxy A will see domainB is not locally 
served and it will forward to proxy B (responsible for domainB). This is 
call inter-domain DNS based routing and it is covered by the OpenSIPS 
default script.


Bogdan-Andrei Iancu
OpenSIPS Founder and Developer

On 31.10.2014 13:13, Michael Leung wrote:
> Hi all
> i know this is a stupid question
> but i dont use sip to make a phone call very often ,
> i have setup up two opensips server in my intranet environment
> i use two phones to register on each server
> how to make a phone call from one to another one
> do i have to add the the destination domain name behind the alias 
> number when i dial out ?
> or why can i dial the alias number without domain name , then the 
> opensips server will routing it to a the opensips server automatically
> thanks
> Michael
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> Users at lists.opensips.org
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