查看“信令接口配置”的源代码

;;;SIP 信令接口配置介绍
signaling 接口负责处理所有的SIP 信令的事务，包括SBC接入和呼出。 SBC的信令接口实际上是SBC 的网络接口，例如eth0，eth1 ..

系统支持还有一个“special” 接口，称之为 sngdsp0 interface。
*此接口 sngdsp0 interface 支持 SBC 访问媒体接口。

 ! Must not be given an IP which is routable within the network.

;;;Signaling Interface Configuration
You must start by configuring all the signaling interfaces you are planning use. 
You can click “Edit” for each network interface you want to configure.
http://manula.s3.amazonaws.com/user/1885/img/nsc-cfg-sig-if.png
SBC Signaling Interface Configuration

Note: 
From the network configuration interface you can also set the hostname, default gateway and the DNS servers. 
If you use DHCP for any of the interfaces you won’t be able to specify a default gateway or DNS servers.

 You can also add VLAN interfaces or interface aliases (Virtual IP) by clicking in the proper “Add” button at the bottom of the network configuration page.

In the above example, interfaces named “sngdsp0” and “sngdsp1” are Sangoma Ethernet interfaces that give access to Sangoma’s media interfaces (DSPs). Unless you are configuring a server for “software transcoding” mode or you have D150 media interfaces, then you need to configure those network interfaces and you must assign an IP to them.