User Guide ISDN Terminal Adapter MTA128ST-USB

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Chapter 4 - AT Commands, S-Registers, and Result Codes
this, enter AT&D0<cr>. With this configuration, the TA can accept calls while DTR is low. If this
configuration setting is not made, the TA rejects incoming calls until DTR is high while calls comes in.
Hanging Up
To hang up a call, escape to online command mode ( +++AT< cr > ), then enter the H command
( ATH< cr > ). The escape sequence and hang up command can be combined into one command string:
+++ATH< cr > .