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The routing policy is the core feature of the VGW-400 series. The policy is based on incoming call type,
destination, length and prefix code to determine the outgoing call routes and process. There are three
routes to go for each incoming call port as shown below.
The following rules do not apply to PABX mode. (For VGW-402 only)
1. VoIP incoming call to the VGW-400 series -- It routes to either FXO or FXS interface and vice versa.
2. FXO incoming call to the VGW-400 series -- It routes to either VoIP or FXS interface and vice versa.
3. FXS incoming call (it means FXS off hook and dialing out) to the VGW-400 series -- It routes to either
FXO or VoIP interface and vice versa.
11.1 For PABX Mode Interface
For this application, FXS outgoing call is routed to either VoIP or FXO and vice versa. The default route
is that VoIP incoming call is routed to FXS and FXS call is routed to VOIP network.
The PABX mode follows these rules to route call as follows:
1. When FXO has an incoming call to the VGW-400 series, it routes to FXS port only.
2. When VoIP has an incoming call to the VGW-400 series, it routes to FXS port only.
3. When FXS makes a dial out, the route call is redirected to either VoIP or FXO according to this
gateway's DM and routing plan.
4-Port SIP Internet Telephony Gateway
Chapter 11 Route Plan
67
VGW-400 Series
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