Telephone Line Control Features
Off-hook
The T-311 takes the line off-hook (“seizes” the line) when commanded by the computer to make or an-
swer a call. The T-311 uses the standard ATD command to dial outgoing calls, but unlike most
modems it provides full call progress monitoring.
On-hook
The T-311 places the line on-hook (disconnects) upon command from the computer, or automatically
if a caller fails the security check, loop current is lost, or inactivity timeout occurs.
Ringing
The T-311 detects ringing on its incoming line. If response messages are enabled, the T-311 sends a
RING message to the computer. The call is automatically answered if Autoanswer is enabled.
Hold
The T-311 puts calls on hold and removes the hold when commanded by the computer.
Communication Features
DTMF/ASCII Conversion
After a telephone connection has been established, ASCII characters from the computer are con-
verted to DTMF tones and forwarded to the network. In the opposite direction, DTMF digits entered at
a telephone keypad are converted to ASCII characters and forwarded to the computer.
FSK Decoding (Caller ID and VMWI)
-- Only Applies to M-311-B-01 Units
The central office (telephone company) sends the FSK signals (Caller ID), after the first ring and be-
fore the second ring. Caller ID information, in single message format and multiple message format,
are decoded and converted to ASCII characters to be transmitted via the RS232C port. Visual
Message Waiting Indication signals are sent during on-hook idle times. These FSK messages are de-
coded and sent out via RS232C along with a visual indication on the front panel of the T-311, to
inform the user of messages waiting in their mailbox.
Electronic Voice
By controlling an audio source such as a recorded tape player or speech synthesizer, the computer
can use the T-311 to send messages to the called party, or record messages received over the phone
line.
Headset Interface
When used with a headset, the T-311 becomes a powerful and efficient “computerized telephone” for
telemarketing and similar applications, relieving the user of most of the mechanics of setting up, dial-
ing, and disconnecting calls.
The headset should meet the following requirements:
•
UL and CSA approval
•
Electret-type microphone (typically battery or AC powered)
•
external amplifier with volume control
•
modular four-wire connector (plugs into front of T-311).
Note:
Headsets with telephone-like features duplicate some of the functions of the T-311 and may
require additional programming.
Reference Manual
Chapter 1: Introduction
40-400-00045, Rev.
B
Page 3
