User guide

Chapter 5: Phone Book Configuration
Multi-Tech Systems, Inc. MVPGSM 77
Sample Outbound Phone Book
The Outbound Phone Book is the director of where calls will be routed from the cellular network to the IP
network – whether that is to a specific phone number, an available extension (Any Number) or to the IP address
of a SIP device or remote VOIP unit for resending as a local call. As in the example previously shown, the phone
books play an integral part in the processing of calls.
Below, we take advantage of Alternate Routing by clicking on the Advanced button for the Outbound Phone
Book entry for our PBX Extension of 301. Then the IP of the alternate device is added to the phone book entry
and the Round Trip Delay is set to 900 ms to allow extra time for the initial connection to attempt successful
completion – once the round trip delay time has been passed without a successful connection, the call will be
routed to the device using IP address 192.168.1.21 (as opposed to the primary device using 192.168.1.11).