Chapter 1: Introduction
With the Teltone T-311 Telephone Access Unit computers can make and answer telephone calls, and
information about those calls can be returned to the computer. While a modem only transmits data
from computer to computer over telephone lines, the T-311 allows communication between called and
calling parties.
This communication is made possible by the conversion of DTMF-to-ASCII and ASCII-to-DTMF. With
the T-311, computers and other terminal devices can control telephone system functions such as an-
swering and placing calls, observing call status, sending or receiving DTMF signals, “flashing” the
line, and coupling audio sources, like speech synthesizers, onto the line.
For compatibility with communications software, the T-311 uses the industry-standard AT command
set. It responds to commands and call processing events by sending messages to the computer.
When used in conjunction with contact management software, the T-311 is a powerful automatic di-
aler. Working with the records from the software database, it speeds call completion by detecting
busy/reorder tone and immediately moving to the next number. The result is increased “talk time”,
thereby improving the efficiency of calling agents.
Using This Manual
This manual is intended to assist developers with tailoring the T-311 to work with a software program.
Some of the steps in the manual are not required for every application and are marked: (Optional).
Complete the optional steps if needed for your application.
Manual Revisions
The information in this manual addresses T-311-B-01 units produced after October 3, 1994 . The pro-
duction date is stamped on the bottom of each T-311 unit. All information related to Caller ID and
Visual Message Waiting are features of the T-311-B-01 ONLY. The T-311-C-01 replaces the
T-311-A-01 and is functionally the same.
Reference Manual
Chapter 1: Introduction
40-400-00045, Rev.
B
Page 1
