SIP (sofia)

The basic Sofia dialstring takes two different formats, depending on wheter we use a gateway or not:

• sofia/<profile name>/<user@domain>
• sofia/gateway/<gateway name>/<user>

As we learned in Chapter 4, User Directory, SIP, and Verto, we can dial another SIP Endpoint, either with or without a gateway. When using Sofia to dial through a FreeSWITCH SIP profile, it is necessary to specify both the user and domain. However, when dialing through a gateway it is not possible to include the domain because this is already defined in the gateway configuration. Therefore, the following is not allowed:

<!-- Wrong --> 
<action application="bridge" data="sofia/gateway/my_gateway/user@1.2.3.4"/> 

The correct syntax is as follows:

<!-- Correct --> 
<action application="bridge" data="sofia/gateway/my_gateway/user"> 

The equivalent for dialing through the internal profile would look like
the following:

<!--Also correct --> 
<action application="bridge" data="sofia/internal/user@1.2.3.4 /"> 
 

When dialing a user who is registered on your FreeSWITCH server there is a shortcut available:

user/<user id>[@domain] 

This syntax makes it very easy to dial another phone registered on your system. In fact, Local_Extension in conf/dialplan/default.xml uses this method to connect calls to registered users:

<action application="bridge" data="user/${dialed_extension}@{domain_name}"/> 

The @domain parameter is optional if you have only one domain defined on your FreeSWITCH server.