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TVP-221H User’s Guide
17
destination for the call is the telephony port where the call terminated. For calls
initiated from telephony ports, the TVP-221H forwards the call to a remote TVP-
221H/TVP-221H via IP network, and the remote TVP-221H/TVP-221H
terminates the call. The destination of the call is the remote TVP-221H/TVP-
224HR.
3.4 Hunt Group
Instead of directly mapping a phone number to a destination, the ATPM first maps
the phone number 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 people 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, the TVP-221H 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 assign a unique hunt group number to a single destination.
In effect, the Hunt Group will just have this one member.
3.5 Dial Plan
The dial plan is a database inside the TVP-221H that allows the ATPM to map
telephone numbers dialed to IP addresses of remote VoIP Gateways. The dial plan
consists of three tables; destination table, hunt group table and the address table.
Users need to setup these tables in order for the TVP-221H to process calls to
remote VoIP Gateways.
3.51 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 starts address
lookup.
• The maximum number of digits the ATPM collects before it considers the
dial string is complete.
• Number of digits forwarded to the destination.