Chapter 2 – AT Commands

Remote Hang-up (enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Remote Hang-up

If the modem is connected (off-hook) and the remote modem/server goes hangs up, the central office may issue a line polarity reversal. If a line polarity reversal is detected, the modem will drop the call and respond with NO CARRIER. The reason for hang-up can be determined by #UD or by S86=25. A line reversal can also be simulated by simply pulling out the telephone line during a connection.

Operation in Voice Mode:Line-In-Use (enabled by AT-STE=1,AT-STE=3,AT-STE=5, or AT-STE=7): This feature does not apply in voice mode.

Extension Pickup (Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7)

If the modem is off-hook and an extension goes off-hook, the modem issues a <DLE>P to the DTE. The application software then hangs up the line (VLS=0).

Remote Hang-up (Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7).

If the modem is off-hook and the remote user goes on-hook, the modem issues a <DLE>P to the DTE. The application software then hangs up the line (VLS=0).

Examples:

User is talking on an extension and the modem tries to dial

 

AT-STE=7

 

ATDT555-1212

 

LINE-IN-USE.

The line is not in use and the modem tries to dial

AT-STE=7

ATDT555-1212

Modem goes off-hook

CONNECT

An extension is off-hook but there is silence on the line and the modem tries to dialAT-STE=3

ATDT555-1212

Modem goes off-hook

NO DIAL TONE

Modem is connected in data mode and remote modem goes on-hook

AT-STE=4

ATDT555-1212

CONNECT

NO CARRIER Remote modem drops line ATS86=?

025

Modem is in answer machine mode and an extension goes off-hook

AT-STE=2

AT+FCLASS=8

OK

<DLE>h Local handset on-hook <DLE>R Ring

AT+VLS=1

OK AT+VSM=1,8000

AT+VTX Starts to play greeting message <DLE>P User picks up extension <DLE>! DTE send abort to end playback AT+VLS=0 DTE hangs up.

Continued on next page.

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

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Multi-Tech Systems MT5600BA-V92 manual Examples

MT5600BA-V92 specifications

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