D-Link DVG-3104MS - VoiceCenter PSTN Gateway User Manual page 30

Section 3 - Configuration
Update: Modify the value of the selected record in the Dialing Plan.
Apply: Click Apply to upload the settings.
Note: There are two default records in the Dialing Plan.
1. Prefix is *0: The DVG-3104MS Gateway supports two VoIP protocols (SIP and IAX) and it can register with the two
different VoIP systems simultaneously. If a caller, who comes from PSTN, dials a number with prefix "*0" as the first
record, the gateway initiates a VoIP call in IAX protocol. If not, it initiates calls in SIP protocol.
2. Prefix is *FXO: It is the necessary rule to forward all calls from IP network to PSTN. For example, a VoIP phone
dials 886287681878 and the call is routed to this gateway (it depends on the configuration on the SIP or IAX server),
the gateway generates the same dial sequence on the PSTN line to reach the destination.
Users can also have their own rules to decide how to route calls. For example, the DVG-3104MS Gateway is connecting
to the internal lines of a traditional PBX and there is one new record as follows:
When the gateway receives a call request with dial sequence "886287681878", it will:
• Reconstruct the dial sequence to "0::87681878" (delete first four digits and add "0::")
• Find a FXO port which is not in use
• Send "0" (It's often a DTMF signal) to the PBX to access an external PSTN line and wait for one second
(one ":" means to delay 0.5 second)
• Then, send the remaining number 87681878 to PSTN through the connecting PBX
It is useful for the gateway which is connecting with the PBX system.
D-Link DVG-3104MS User Manual 30