Multi-Tech Systems MVP210-SS - Manual (Page 226)

T1 Phonebook Configuration MultiVOIP User Guide
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Similarly, the Inbound PhoneBook for the Baltimore VOIP (shown first
below) generally matches the Outbound PhoneBook of the Minneapolis
VOIP (shown second below).
Notice the extended prefix to be removed: 14103257. This entry allows
Minneapolis users to contact Baltimore co-workers as though they were
in the Minneapolis facility, using numbers in the range 7000 to 7999.
Note also that a comma (as in the entry 9,443) denotes a delay in
dialing. A one-second delay is commonly used to allow a second dial
tone to be generated for calls going outside of the facility’s PBX system.