Silicon Laboratories SI2494/39 manual Command Action Analog Source / Destination Selection

			AN93
	Table 110. Extended AT+ Command Set (Continued)
Command			Action
		Analog Source / Destination Selection
		<label>	Description
		0	DCE is on-hook. AOUT disabled. Tone detectors disabled.
			Si3000 sample pass-through to DAA is inactive.
		1	DCE is off-hook. AOUT disabled. Tone detectors disabled.
		4	DCE is on-hook. AOUT connected to tone generators.
			Tone detectors disabled.
		5	DCE is off-hook. AOUT connected to PSTN.
			Tone detectors enabled.
		13	DCE is off-hook. V.253 tone event reporting enabled. Si3000 sample
		pass-through to DAA is active with options for speakerphone operation.
+VLS = <label>		14	DCE is on-hook. V.253 tone event reporting enabled. Si3000 interface
		is active for DTE voice stream pass-through.
		15	DCE is off-hook. V.253 tone event reporting enabled. Si3000 sample
		pass-through to DAA is active with options for handset operation.
		20	DCE is on-hook. AOUT disabled. Tone detectors enabled.
		21	DCE is on-hook. AOUT connected to tone generators. Tone detectors
		enabled.
		Table 117 on page 190 shows the voice-mode operation and the signal paths. See
		10.2.4.2 of V.253 for an explanation of the AT +VLS=? command results. If an ATD
		command is sent while the DCE is in VLS=0 and +FCLASS=8, the DCE will automati-
		cally transition to VLS=1. The ATH command will automatically force the DCE to
		VLS=0. The main options of interest are the 0, 13, 14, and 5. The +VLS=0 setting
		must be applied first before applying a new +VLS value to ensure the mode is exited
		properly.
		Automatic Hangup Control
		<hook>	Description
		0	The DCE retains automatic hangups as is normal in the other modes
+VNH = <hook>		(such as hanging up the phone when the ISOmodem does not detect a data carrier
		with a given time interval).
		1	The DCE shall disable automatic hangups in the other non-voice
		modes.
		2	The DCE shall disable all hang-ups in other non-voice modes. The
		DCE shall only perform a “logical” hangup (return the OK result code).
		Ringing Tone Goes Away Timer
+VRA = <interval>		The DCE only uses this command in call origination transactions. This command sets
		the amount of time in 0.1 second units the DCE shall wait between Ringing Tone
		before it can assume that the remote modem has gone off-hook. Default time is five
		seconds.
		Repeat Caller ID
		<rmode>	Description
+VRID = <rmode>		0	Display Caller ID information of the last incoming call in formatted
		form.
		1	Display Caller ID information of the last incoming call in unformatted
		form.

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