ZyXEL Elite 2864 User Guide - Page 196

The DCE returns the OK result code if the DCE accepts this command, or it returns the ERROR result code if the 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 Note: AT+VSY is not defined in the IS-101. The IS-101 did define that the DTE can send a code to have the DCE reset its decompressor and concatenate following voice data. The IS-101 did not have a command to have the DCE periodically reset its compressor and generate resync symbols in voice recording mode. 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 command to set the resync interval. Set AT+VSY=0 (default) to disable resync generation. 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 history. 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 code - (hex 10 and 12). Note: The resync symbol can also be used as a timing mark. Examples of Voice Mode Operation Greeting message recording (Connect a telephone set to the PHONE RJ11C jack). DTE AT+FCLASS=8 AT+VSM=? DCE → ← OK → Description Switches to voice mode. 16-20