5-5
Issue 1 April 1994
Table 5-1. Initiating a VoiceSpan Session (2 of 2)
Originating End
Answering End
The application sends an ATDT
(tone dial) command to the
DataPort 2001. The DataPort
2001 responds by sending
VoiceSpan ring signals to the
remote modem.
Upon detection of the
VoiceSpan ring signal followed
by a silence, the answering
modem stops transmitting
voice, and sends the RING
message to the local DTE.
The application may send an
ATA (answer) command to the
modem, or the modem may
reach its configured ring count
for auto-answer. In either
case, the modem sends the
signals to initiate VoiceSpan
mode.
The originating modem detects
the VoiceSpan signals and the
two modems establish a
VoiceSpan connection. The
originating modem sends a
CONNECT message to the
DTE, and the VoiceSpan ready
signal to the local phone.
The answering modem sends
a CONNECT message to the
DTE, and the VoiceSpan
ready signal to the local
phone.
The VoiceSpan session begins.
The DataPort 2001 supports the possible combinations of
Manual Dial, Manual Answer, Auto-Dial, and Auto-Answer. In
cases where there is no local telephone off-hook, the DataPort
2001 connects in data-only VoiceSpan mode (no audio).
