Motorola SM56 manual +Vsm, +Vtd, +Vts

Table 4: AT+ (Plus) Commands

Command	Option	Description
	0	Use current +VSM value; or, if current +VSM value
		is 0, use 128.
	127	Low Threshold (most sensitive)
	128	Medium Threshold
	129	High Threshold (least sensitive)
	n options:	Specifies the silence-detection duration
	0	Disable
	1-255	Detect n/10 seconds silence; n = 0-255
	50	Default = 5 seconds
+VSM		Speech Compression Properties
		Data/Fax/Speakerphone modem only
	+VSM=m,n,	Specifies the speakerphone compression parameters
	p,q
	m options:	Specifies the compression method
	128	PCM
	129	ADPCM
	n options:	Specifies the sampling rate to determine whether to
		compress
	8000	8000 Hz
	p options:	Parameter p specifies compression and expansion of
		periods of silence. These parameters are not imple-
		mented in Release 1.0. You may leave them blank or
		enter the value 0.
	0	Disable
	q options:	Parameter q specifies compression and expansion of
		periods of silence. These parameters are not imple-
		mented in Release 1.0. You may leave them blank or
		enter the value 0.
	0	Disable
+VTD		Dual Tone Multi-Frequency (DTMF) Tone Dura-
		tion
		Data/Fax/Speakerphone modem only
	+VTDn	Generates tone for n/100 seconds; n = 0-255.
		Default=100.
+VTS		DTMF Tone Generation Properties
		Data/Fax/Speakerphone modem only
		+VTS accepts multiple options, separated by com-
		mas, of any of the following types. Use square or
		curly brackets as shown.

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