View source for General Application of Digital Gateway – VoIP

[[File:Gad-v-1.png|VoIP]] <br />
The following operations are supported.
*PSTN can call the phones connected with the analog gateways as shown in the figure above via digital gateways.
*The phones connected to an analog gateway can call PSTN via digital gateways
Follow the steps below to configure the gateway for such application (taking ISDN for example). <br />
1）Do SIP settings.<br />
[[File:Gad-v-2.png|VoIP]] <br />
Set the LAN for SIP call processing.<br />
2）Set SIP trunks.<br />
[[File:Gad-v-3.png|VoIP]] <br />
Set to allocate the 120-channel voice resources of the digital gateway to the VOS softswitch platform to process the SIP calls on the platform.<br />
3）Set SIP trunk groups.<br />
[[File:Gad-v-4.png|VoIP]] <br />
Add the SIP trunks in Step 2 to a SIP trunk group for subsequent route settings.<br />
4）Configure the gateway mode to ISDN.<br />
[[File:Gad-v-5.png|VoIP]] <br />
5）Set PCM trunk groups.<br />
[[File:Gad-v-6.png|VoIP]] <br />
Add all PCM trunks to a same PCM trunk group.<br />
6）Set IP  PSTN routing.<br />
[[File:Gad-v-7.png|VoIP]] <br />
Set to enable all the SIP calls from any VOS platform to go out via PCM Trunk Group 0.<br />
7）Set PSTN  IP routing.<br />
[[File:Gad-v-8.png|VoIP]] <br />
Set to enable all the calls from any PCM trunk to go to a VOS platform which will subsequently switch them to other analog gateways.