User`s manual

AT Command Reference Manual
7-38 1048
Table 7-10. Call/Record Message/Receive Fax
DTE to Modem Modem to DTE Description and Interpretation
#CLS=8 Configure the modem for Voice Mode.
OK The modem agrees, and is now set up for voice.
#VBS=4 The DTE asks for 4-bit compression (ADPCM). The DTE needs to work at 38,400 bps
since after start and stop bits are added the speed increases to 36,000 bps.
OK The modem is configured for 4-bit compression.
#VSS=2 Sets silence detection sensitivity to midrange.
OK The modem confirms command reception.
#VLS=0 This selects the telephone line, and ensures that it is on-hook.
OK The modem confirms command reception, and switches in the telephone line.
#CLS=8 This ensure things are set up for voice.
OK The modem confirms command reception, and is now set up for voice.
RING Sometime later, the next call is received. The modem answers.
#BDR=16 The DTE knows that compression requires a 38,400 bps speed, so it forces this as the
new speed. (For this example, lets say that the DTE was sending all commands,
including this one, at 9600 bps.)
OK This OK message is sent at 9600 bps, but the modem then switches to 38,400 bps. All
subsequent commands are assumed to be sent at 38,400 bps. The S30 timer is now
active.
A The DTE answers.
VCON The modem is now in Online Voice Command Mode. DTMF and calling tone detection
is enabled.
#VTX The DTE does not wait for any tones, and tells the modem that it is ready to send a
voice greeting at the current compression and sampling settings.
CONNECT The modem tells the DTE that it can now send data. The modem enters Voice
Transmit Mode and DTMF monitoring is still enabled as well as ADPCM data flow.
<Data> The DTE sends greeting message data. The modem waits 1 second before starting to
transmit to ensure uninterrupted data flow. If the voice transmit buffer runs empty, the
transmission is disabled.
<DLE><ETX> The DTE has finished its transmission and now instructs the modem to enter Online
Voice Command Mode.
VCON The modem tells the DTE it is done. If the DTE sends the <DLE><ETX> before the
modem has finished transmitting all the data in its voice transmit buffer, this response
is delayed until the buffer is empty.
#VBT=13 The DTE requests that DTMF digits be dialed as “beeps” while in Online Voice
Command Mode, with each “beep” having a duration of 1.3 seconds.
OK The modem agrees.
#VTS=
[1000,0,20],9,
The DTE sends a “BEEP” to annotate its greeting message. This beep is a 2 second
long 1000 Hz tone, followed by a 1.3 second long DTMF 9. During this period, the DTE
is locked out.
OK After the modem sends the “BEEP”, it sends OK to inform the DTE that it is ready to
move on. DTMF pass through is re-enabled.