Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 117)

Global Configuration Commands
Cellular Text Telephone Modem +WCTM
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WM_DEV_OAT_UGD_049 - 001 VOLUME 1 August 23, 2007
6.22 Cellular Text Telephone Modem +WCTM
6.22.1 Description
This Wavecom proprietary command allows the user to activate and deactivate the
Cellular Text telephone Modem capability for outgoing voice call as specified in 3GPP
24.008
181H
[8].
CTM mode is used to send audio signals from an external text terminal (ex: a TTY
typewriter) within a voice call made by the ME. The text terminal must have a special
mobile phone input/output to work correctly.
When the ME indicates that CTM text telephony for an outgoing voice call is
supported, the network selects a speech CODEC and additionally CTM text telephony
detection and conversion functions.
To guarantee optimal audio management of CTM signals, it is mandatory to
deactivate Acoustic Echo Cancellation (see +ECHO command) and Side Tone (see
+SIDET command).
Voice gain of transmitter and receiver (see +VGR, +VGT commands) have to be
calibrated according to the external text terminal audio characteristics.
6.22.2 Syntax
Action command
AT+WCTM=<mode>
OK
Read command
AT+WCTM?
+WCTM: <mode>
OK
Test command
AT+WCTM=?
+WCTM: (list of supported <mode>s)
OK