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16–20
The DCE returns the OK result code if the DCE accepts this command, or it re-
turns the ERROR result code if the <timer> value is out of range.
• AT+VSY?
The DCE returns the current resync timer value, followed by the OK result code.
• AT+VSY=?
The DCE returns the permitted interval of the resync timer. The response is:
0-255
OK
Voice Data Format
The voice data file format is described in the ZFAX documentation on the software
floppy disk. Compressed voice data has a continuity property, i.e., you cannot cut
and paste to edit the voice files. In order to enable editing, resync symbols can be
inserted into the ADPCM voice data at regular intervals. Use the AT+VSY com-
mand to set the resync interval. Set AT+VSY=0 (default) to disable resync genera-
tion. The unit of a resync interval is 50ms. The ADPCM coder is reset with every
resync symbol, thus the ADPCM voice data will not depend on a too long data his-
tory. If you convert the compressed voice data into the uncompressed PCM data
file, you can always edit the PCM file with no problem. The resync symbol is a
shielded <DLE> code - <DLE><DC2> (hex 10 and 12).
Examples of Voice Mode Operation
Greeting message recording
(Connect a telephone set to the PHONE RJ11C jack).
Note: AT+VSY is not defined in the IS-101. The IS-101 did define that the
DTE can send a <DLE><FS> code to have the DCE reset its de-
compressor and concatenate following voice data. The IS-101 did
not have a command to have the DCE periodically reset its com-
pressor and generate resync symbols in voice recording mode.
Note: The resync symbol can also be used as a timing mark.
DTE DCE Description
AT+FCLASS=8 → Switches to voice mode.
← OK
AT+VSM=? →