查看“SIP Domain Configuration”的源代码

;;;SIP Domain 介绍
Domains 在SIP 网络中也被称之为“Realms”。

一个domain或者SIP realm 都是SIP的核心部分，用来支持SIP用户的注册验证。Domain profiles 用来定义SBC中SIP用户验证的方式。
*本地验证是用来对用户注册到SBC时使用的方式。
*Upper registration 使用当用户通过SBC注册到一个软交换平台或者IPPBX平台。
这样的方式就实现了内网设备的隐藏，外网用户不会知道SBC后面的内网设置状态。

 Domains 不是必须的。如果用户不是使用SIP注册或者正在使用IP验证方式，用户则不需要domain profile。

;;;SIP Domain Configuration
添加SIP domain，点击菜单“Configuration -> Signaling -> Domains”
http://manula.s3.amazonaws.com/user/1885/img/nsc-domain-add2.png

All you need to provide to add a domain is the domain name, which should be a FQDN string (ie mycompany.com).

The system will then prompt you to select whether you want to enable “Forward Registration / Authentication”. If you want NSC to handle authentication of SIP requests (ie REGISTER, INVITE) using the local user database, you must choose “Disable”. If you plan to forward authentication to a third-party server (ie a registrar server or PBX) you must select “Enable” and provide the information of the third-party server that will handle authentication of those SIP requests.
http://manula.s3.amazonaws.com/user/1885/img/nsc-domain-forward-info1.png


If you wish to create SIP accounts (users) you can click the “Add” button in the domain edit page.
http://manula.s3.amazonaws.com/user/1885/img/nsc-domain-add-user.png


*You can create as many domains as you want.
*Later you can “Bind” a domain to one or more SIP profiles.
*See the SIP profile configuration for details.
 !Note that the directory of users for that domain will only be valid when using a SIP profile that is bound to that domain.