Operating instructions

TransTel Model TD-824-I Digital Telephone System – Programming Forms Manual
Page 147
Caller ID and Redial Patterns
The bulk of programming necessary for addition of the Caller ID device is to implement Redial capabilities on
identified calls. This is an issue that has kept most telephone manufacturers from incorporating redial on telephone
systems equipped with Caller ID. Software shipped with the TD-824i properly addresses what we believe to be all
the possible dialing situations in North America.
However, in order to properly program the Caller ID redial capabilities, you must understand what your local
telephone company (telco) expects for each call that you dial.
The information (digits that must be dialed) will vary depending on your local telco’s requirements. Unfortunately
there is no “one size fits all” configuration that will work. Each system must be custom tailored to the particular
dialing patterns at the site. The following section is designed to explain the possible variants you may encounter
during installation.
U.S. Caller ID Overview
Caller ID is delivered to telephone lines in the U.S. containing 10 digits (conforming to the North American
Numbering Plan) which consist of NXX-NXX-XXXX, where N is a digit from 2 through 9 and X is any digit from 0
through 9.
For reference through this section:
• The (NXX)-NXX-XXXX of the number is referred to as the Area Code.
• The NXX-(NXX)-XXXX is referred to as the Office Code.
• The NXX-NXX-(XXXX) is referred to as the Subscriber Number.
This applies to both local and toll calls.
Caller ID delivers the entire NXX-NXX-XXXX to a Caller Id subscriber or it delivers a code indicating the
unavailability of Caller ID information. Caller ID is never abbreviated to less than 10 digits.
Various North American Dialing sequences
1. Local Call (7 digit)
In most areas, local calls are a 7 digit number, which consist of the 7 right-most digits. The Area Code (the first
NXX) is not used.
TransTel Communications, telephone number is Area Code 561, the Office Code is 747 and our Subscriber
Number is 4466.
Another telephone user within our local dialing area will dial only 747-4466. This is the only dialing string the local
telco will accept.
For example: If I receive a call from the business next door, my caller ID unit will display 561-555-3489. In order
to redial the call, I must dial 555 + 3489. It will be necessary to program the TD-824i to recognize that the
561-555 area code and office code combination is local and will disregard the area code and dial only the
office code and subscriber number (555+3489).
In order to make the TD-824i redial this number properly, set Form 84-01-01 with a value of 561 (Home Area
Code). You will also set Form 86-555 to a value of 0. This tells the TD-824i when it sees the area code of 561
AND the office code of 555, the redial function will be to dial only the office code and subscriber number
(555+3489).