Silicon Laboratories SI2493/57/34/15/04 manual Command Action Ringing Tone Never Appeared Timer

AN93

	Table 110. Extended AT+ Command Set (Continued)
Command			Action
		Ringing Tone Never Appeared Timer
+VRN		This command sets the amount of time in seconds the DCE will wait looking for Ring-
		ing Tone. If the DCE does not detect Ringing Tone in this time period, the DCE shall
		assume that the remote station has gone off-hook and return an OK result code.
		Default time is 0 seconds.
		Receive Voice Stream
		Enable DTE receive of voice stream. The DCE will return a CONNECT response fol-
		lowed by the voice stream as defined by the +VSM command. The DTE can issue a
		<DLE><!> or <DLE><ESC> sequence to terminate the receive stream. The DCE will
+VRX		return a <DLE><ETX> followed by an OK response for <DLE><!> and <DLE><ESC>
		followed by an OK response for <DLE><ESC>. The DCE can be configured to termi-
		nate the stream using the DTE/DCE Inactivity Timer, which is configured using the
		+VIT command. The DTE will need to process any <DLE> shielded events present in
		the data stream. Any <DLE><DLE> sequences can be preserved to allow less over-
		head during playback of the stream with the +VTX command.
		Silence Detection
		<sds>	Silence Detection Sensitivity
		118	More sensitive: lower noise levels considered to be silence
+VSD = <sds>, <sdi>		128	Nominal level of sensitivity.
		138	Less sensitive: higher noise levels considered to be silence
		<sdi>	Silence Detection Interval
		The time interval in 0.1 second units, which must contain no or little activity, before the
		DCE will report (QUIET) (<DLE><q>). Default is five seconds.
		Compression Selection Method
		<cml>	Compression Mode
		0	Signed linear PCM, 8-bit, 64 kbps
		1	Unsigned linear PCM, 8-bit, 64 kbps
+VSM = <cml>		4	G.711U μ-law companding PCM, 8-bit, 64 kbps
		5	G.711A A-law companding PCM, 8-bit, 64 kbps
		129	G.726 ADPCM, 2-bit, 16 kbps
		131	G.726 ADPCM, 4-bit, 32 kbps
		All compression modes use a fixed sampling rate of 8 kHz. See 10.2.8.2 of V.253 for
		an explanation of the +VSM=? command results.
		Voice Speakerphone State
		<mode>	Description
+VSP = <mode>		0	Speakerphone AEC, AES and LEC disabled. Handset FIR filter
		coefficients are selected.
		1	Speakerphone AEC, AES and LEC enabled. Speakerphone FIR filter
		coefficients are selected. The +VLS=13 command must be used in combination with
		this setting.
+VTD = <dur>		DTMF / Tone Duration Timer
		This command sets the default DTMF / tone generation duration in 10 ms units for the
		+VTS command. Default time is 1 second (<dur> = 100).

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