Voice At Commands; Command Syntax; Response Syntax - ZyXEL Communications U-1496 series User Manual

announcement and will not get connected. Even if the data call is connected successfully, the
longer handshake delay may not be acceptable in some applications. The modem can decide a
fax or data call quicker if a calling tone is received. The voice announcement can be omitted in
this case.
ZyXEL will continue to work on improvements of automatic detection of voice, fax, and data.
New capabilities or enhancements will be released in future versions of its firmware.

VOICE AT COMMANDS

The U-1496 series modems support a set of voice AT commands. These commands are
basically consistent with the TIA TR29.2 committee PN-2986 document. ZyXEL is continuously
enhancing its modem's voice capability and voice command implementation. Please refer to the
manual amendment or firmware release notes for updated details.
The following is a summary of the supported voice AT commands:

COMMAND SYNTAX

AT is used as the command line prefix. The voice command takes one of the following forms:
+V<CM>? read current setting
+V<CM>=? read permissible setting
+V<CM>=<single value> set single-value parameter
+V<CM>=<value string> set compound parameter
where <CM> represents a two-letter command syntax. A value string consists of values
separated by a comma or semicolon. The first two command forms are for read actions, the last
two are for write actions. A command may have both action types or be just read or write type
only.

RESPONSE SYNTAX

For each command line received, the modem issues response to each command in the
command line followed by a final response.
Each command response is of the form:
<CR><LF>
<value> or <value range>response to "?" or "=?" command
<CR><LF>
The final response is
<CR><LF>
OK or ERROR Command line response
<CR><LF>
The final response is " OK " if all the commands in the command line have been successfully
executed, otherwise it is "ERROR".