Multi-Tech Systems E1 - Manual (Page 219)

MultiVOIP User Guide E1 PhoneBook Configuration
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2. The Add/Edit Outbound PhoneBook screen appears.
Enter Outbound PhoneBook data for your MultiVOIP unit. Note that
the Advanced button gives access to the Alternate IP Routing feature, if
needed. Alternate IP Routing can be implemented in a secondary
screen (as described after the primary screen field definitions below).