How to register a VoIP trunk?

In the configuration page of “Trunks”, click

Add VoIP Trunk

and enter the following information in the popup window. (Take the IMS trunk provided by Chinamobile as an example.)
Provider Name: 

Chinamobile

 

Hostname/IP:

the IP address provided by Chinamobile for registration (e.g.: 111.111.111.111)
Port:

5060
Domain:

the domain provided by Chinamobile (e.g.: ims.fj.chinamobile.com)
User Name:

the user name provided by Chinamobile (e.g: 865921111111@ims.fj.chinamobile.com)
Password:

the password provided by Chinamobile)
From User:

+86592111111
Maximum Channels: the number of the channels of each line you applied for (e.g.: 2) Caller ID: +86592111111