Multi-Tech Systems MT5600BA-V92 manual Call Control Command, Command -STE= Set Telephony Extension

				Chapter 2 – AT Commands
Call Control Command
Command: -STE=	Set Telephony Extension
Description:	This command enables/disables Line-In-Use, Extension Pickup, and Remote Hang up
	detection features.
	Note: Additional hardware may be required to support these features.
	Syntax: -STE=<value>
Values:	<value> Decimal number corresponding to the selected bit-mapped options.
	The bit fields are defined as follows:
	Bit 0	Line-In-Use detection – enable/disable.
	Bit 1	Extension Pickup – detection enable/disable.
	Bit 2	Remote Hang up – detection enable/disable.
	<value> (decimal)		Remote Hangup	Extension Pickup	Line-in-Use
	0 (default)		Disabled	Disabled	Disabled
	1		Disabled	Disabled	Enabled
	2		Disabled	Enabled	Disabled
	3		Disabled	Enabled	Enabled
	4		Enabled	Disabled	Disabled
	5		Enabled	Disabled	Enabled
	6		Enabled	Enabled	Disabled
	7		Enabled	Enabled	Enabled
Report Commands:	-STE? Reports current or selected values
	-STE=? Reports supported range of parameter values
Result Codes:	OK <value> = 0-7
	ERROR Otherwise.

Behavior in Data Mode (+FCLASS=0):

When on-hook, if the line is in use and an ATDT is issued, the modem will not go off-hook and will return with the message LINE-IN-USE.

When off-hook and either an extension is picked up or a line reversal is detected, the modem will drop the connection. The disconnect reason in register S86=25 (also defined for #UD). The user must flash the hook in order to get a dial tone because the remote server will be retraining.

If local handset is picked up while modem is off-hook, modem will do a link-disconnect, flash the hook for 1.5 seconds, then connect local handset to the line. Now, the user dial tone is on the local handset. Disconnect reason S86=25.

Behavior in Voice Mode (+FCLASS=8):

When in voice mode and an extension is picked-up, a <DLE>P is sent to the DTE. When the modem is off-hook, a line reversal may also be detected in which case a <DLE>l is sent to the DTE.

In voice mode, there is no blocking of ATDT when the line is in use. Also, there is no automatic hang-up in voice mode as in data mode. There is only the above stated <DLE> shielding event reporting.

Operation in Data Mode: Line-In-Use (Enabled by AT-STE=1,AT-STE=3,AT-STE=5, or AT-STE=7)

Case 1: Telephone Line is in Use

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is enabled and the telephone line is in use, the modem will immediately return the message LINE-IN-USE to the DTE without going off-hook, and then return to command mode.

Case 2: Telephone Line is in Use But Disconnected

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is enabled and the telephone line is NOT in use, the modem will go off-hook after a short pause, then respond with CONNECT or NO CARRIER message.

Case 3: Telephone Line is Not Connected to Modem

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is enabled and the telephone line is not connected, the modem will go off-hook momentarily, go back on- hook, then respond with NO DIAL TONE message.

Extension Pick-up (Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Local Handset Goes Off-Hook

If the local handset goes off-hook while the modem is in a data connection, the modem will then send a GSTN Clear down to the remote modem and then go on-hook. The modem will then send a NO CARRIER message to the DTE. A result code of 25 will be left in S86 register.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G) 25