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VIP User’s Manual
VIP Concepts
8
3.4 Hunt Group
Instead of directly mapping a phone number to a destination, the ATPM first maps the phone num-
ber to a group of destinations known as a Hunt Group. A hunt group is a group of destinations that
are equivalent. For example, the customer support group of a company might have 20 peo-
ple who can handle support calls. Access to customer support is through a single phone
number but the next available support person is actually connected upon each incoming
call. These 20 phones would be configured as a hunt group. A hunt group consists of a
phone number and a list of destinations (members of the group). When an incoming phone
number matches the phone number of the hunt group, VIP attempts to terminate the call at each of
the destinations in the hunt group, one at a time until a call is successfully completed.
Every destination that can be reached by dialing a phone number is a member of at least one hunt
group. When an address is presented to ATPM for lookup, the output is a hunt group ID number.
As a second step, the hunt group ID is presented to ATPM to get the list of members. To effectively
bypass the hunt group feature, simply make a unique hunt group for each destination and one
member in each hunt group.
3.5 Dial Plan
The dial plan is a database inside VIP for the ATPM to map telephony numbers users dialed to the
IP address of remote VIPs. The dial plan consists of the destination table, hunt group table and the
address table. Users need to setup these tables, so that VIP knows how to setup calls with remote
VIPs.
Address Table
The address table maps a phone number to a hunt group. The table contains entries that specify
the following information:
·
Telephone number
·
The hunt group the phone number maps to.
·
The minimum number of digits to collect before the ATPM starting address lookup.
·
The maximum number of digits the ATPM collects before it considers the dial string is
complete.
·
Number of digits forward to the destination.
Address table sample:
Address Entry
Hunt Grp_Id Min. Digits
Max. Digits
Prefix strip Prefix Address
200 1 3 3 0 None
201 3 3 3 0 None
899 11 3 3 0 None
8 11 3 3 0 None
0 5 1 1 0 None
03 5 10 10 2 “0”