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2.3
CHANGES TO CENTRAL OFFICE TRUNKING
Central Office (CO) changes may be needed to:
•
Add trunking capability.
•
Change the order of trunk hunting.
•
Create new trunk hunting groups.
•
Add, change, or delete InWATS (1-800) services.
•
Add, change, or delete DID or Centrex services.
•
Split the hunt group (directory listed number), allowing some trunks to be directed to the console
and some to the VP 300.
I Additional Trunking
The specific number of PBX lines and trunks depends upon the number of VP 300 ports and the
desired trunking arrangement.
Although the VP 300 port drops off after it transfers a call, the CO trunk is still occupied during the
entire call. When you decide how many trunks to direct to the VP 300, remember each trunk is
occupied from the time the call is placed until the caller hangs up. As a result, the VP 300 can answer
incoming calls from more trunks than it has ports.
Determine how many trunks to direct to the VP 300 by using PBX traffic data and the traffic
engineering tables. The tables are designed to help decide how to use the VP 300 most effectively for a
given situation. After collecting the traffic data, it may be necessary to order changes from the
telephone company to add or alter the number of trunks.
I Splitting Trunk Groups
If one two-way trunk group will be separated into two or more groups, the rotary hunting of the trunks
must be changed.
The VP 300 only handles incoming calls. If the trunks the VP 300 answers are two-way trunks (also
used for outgoing calls), make sure that sufficient trunks are available for both incoming and outgoing
calls. Additional trunks or changes to the type of trunks may be advisable.
I Ordering CO Trunking Changes
Contact the customer about making arrangements for changes in trunking. Typically, these changes
require significant lead time. The CO requires an agency letter from the customer authorizing you to
act on their behalf.
Figure 2-3 is a sample agency letter you may want to use.
PREPARING THE PHONE SYSTEM
Toshiba VP Systems Release 6.1 February, 1993
2-5
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