TRENDnet VoIP Gateway Network Hardware User Manual


 
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.