ZyXEL Communications Omni 288S User Manual page 94

2. The DTE sends a <DLE><!> shielded code.
3. A DTE/DCE Inactivity Timer time-out.
Upon termination of the voice state, the DCE will append a <DLE><ETX>
character pair, followed by the OK result code. The DCE then returns to Voice
Command State.
The Inactivity Timer is in effect while the reception operation is in progress. If
the DTE wishes to use this timer and stop the DCE from performing unwanted
restarts, the DTE must assure that there is data sent from the DTE to the DCE
often enough to refresh the timer; the DTE may use the <DLE><NUL> shielded
code as a no-operation command to refresh the timer.
AT+VTS=<string>
This command causes the DCE to issue DTMF single frequency tones, and
optionally, double frequency tones. The DCE accepts <DLE><!> to abort playing
tones, the OK result code, and to the Voice Command State.
The tone generation string consists of elements in a list with each element
separated by a comma. Each element can be:
1. A single ASCII character in the set 0-9, A-D, #, and *. The DCE interprets
the single ASCII character as a DTMF digit with a duration given by the
+VTD command.
2. A string enclosed in square brackets, "[ ]." The DCE interprets the values in
square brackets as a general dual tone and duration selection. The quantity
within the square brackets consists of a three element list. The first element is
the first frequency, the second element is the second frequency, and the third
element is the tone duration in 10 ms intervals.
3. A string enclosed in curly braces, "{}." The DCE interprets the quantity in
the braces as a DTMF tone with a different duration than that given by the
+VTD command. The quantity in the curly braces consists of a two element
list. The first element is the DTMF tone character and the second element is
the tone duration in 10 ms intervals. For every inter-element comma in the
list, the DCE pauses for an interval set by the +VTD command.
AT+VTS=?
This command causes the DCE to report the allowable tone frequency range and
duration range. The Omni uses two tones, both in the frequency range of 20 to
4800 Hz, and a duration range from 0 to 10 seconds. The response is as follows:
(20-4800),(20-4800),(0-1000), 0-9, A-D, *, #
OK
AT+VTX
Chapter 10 - Voice Mode Operation
10-15