Multi-Tech Systems MT5634SMI V.34 Command +VDT=enable,report Control Tone Cadence Reporting, 117

				Chapter 4 – Voice Commands
Command:	+VDT=<enable>,<report>			Control Tone Cadence Reporting
Result Codes:	OK if the modem accepts the command; ERROR if the parameter is out of range.
Description:	The +VDT command causes the modem to enable or disable reporting of the control tone
	cadence information in the frequency band used by the Ring Back/Remote Ring, Busy,
	and Reorder/Fast Busy tones (usually in the 300 - 600 Hz range). This reporting is
	subject to the tone detection restrictions reported by the +VLS=? command.
	The report format is one line per silence period, and one line per ring period. The length
	of the silence period is in the form CPOF=<number in units of 0.1 seconds><CR><LF>,
	and the length of the ring period is in the form CPON=<number in units of 0.1 seconds>.
	The <LR> character is optional.
	Note: The +VEM command can disable the reporting of this command regardless of the
		current setting of the +VDT= command.
	<enable> <report>		Description
	0	N/A	The modem will not generate control tone cadence reports. Control
			tone event codes are reported as normal.
	1	0	The modem only produces DROF and DRON messages. The
			modem will not report any Ring Back/Remote Ring, Busy, and
			Reorder/Fast Busy tones event codes. Other control tone event
			codes are reported as normal.
	1	non-zero	(for future implementation)
	2-255	non-zero	Reserved for future standards.
	Example: The lines below shows control tone cadence reporting enabled, with an on
	tone of 2.0 seconds and an off time of 4.0 seconds. The command used to enable the
	sample sequence is +VDT=1. Note the absence of the Ring Back/Remote Ring, Busy,
	and Reorder/Fast Tone event reports.
	CPOF=40
	CPON=20
	CPOF=40
	CPON=20
	CPOF=40
	CPON=20
Command:	+VEM=<mask>			Event Reporting and Masking
Values:	bits 0–32 on (i.e., FFFFFFFF8)
Result Codes:	OK if the modem accepts this command; ERROR if the bit field contains illegal
		characters.
Description:	The +VEM= command can be used to disable an event report, regardless of the modem's
	state, or of the modem's analog signal source or destination's configuration. The <mask>
	parameter is a bit field where bit 0 is the most significant bit of an eight-digit hex number.
	The PC setting of a bit enable event reporting for that event. Bit 0 in the bit field

corresponds to Event number 0 (Caller ID) (see Features Matrix for models that support Caller ID). This mask effects the reporting of the specified event in all modes (Fax, On- line data, AT Command and Voice modes). Events cannot be masked by modes; however, the PC can change the mask each time it changes modes. The modem- detectable events depend on the compression method selected by the +VSM command. The +VEM command may effect the reporting capabilities of other +V commands. The detection of an event may not be possible at all times and for all compression methods. Use the +VLS=? command to ask which times and for which compression methods (as well as for which analog source/destination selections) events can be detected and reported when not disabled by the +VEM command.

Example: In the lines below, only the RING and the DTMF event detection reporting:

AT+VEM=18000000

OK

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 117