PIONEERPOS G24-LC manual 32 +MTTY Parameters, At+Mtty?, At+Mtty=?

Call Control

Command
Type	Syntax	Response/Action	Remarks
Set	AT+MTTY=<n>	OK	The SET command is used for setting
		or:	the current TTY mode.
		+CME ERROR: <err>
Read	AT+MTTY?	+ MTTY : <n>	The READ command returns the
		OK	current TTY mode <n>.
		or:
		+CME ERROR: <err>
Test	AT+MTTY=?	+MTTY : (0-3)	The Test command returns the possible
		OK	value’s range.
		or:
		+CME ERROR: <err>

The following table shows the +MTTY parameters.

		Table 3-32: +MTTY Parameters
<Parameter>		Description
<n>	0	Normal voice mode.
	1	Full TTY mode (both uplink and downlink support TTY data; used when both
		side parties are deaf).
	2	VCO mode (Voice Carry Over- uplink is voice active downlink is TTY).
	3	HCO mode (Hearing Carry Over-downlink is voice active uplink is TTY).
	The default value:
	• On Power Up - as previously saved in FLEX bytes.
	• Before set command is first used, mode is set to Normal voice mode.

Notes:

VCO: Voice Carry Over is intended for people who cannot hear but are able to speak clearly. During a VCO relay call, the Deaf or Hard-of-Hearing caller speaks directly to the person they are conversing with. When that person responds, a Communication Assistant (CA) will type back exactly what is said and it will appear on the screen of your TTY or VCO phone.

HCO: Hearing Carry Over allows Speech Disabled callers who can hear well on the telephone to listen directly to the person they are talking with. The Speech Disabled Relay user types his or her part of the conversation on a TTY. A Communication Assistant (CA) then speaks the typed conversation, word for word, to the standard telephone user.

3-58 G24-L AT Commands Reference Manual April 15, 2008