Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 619)

Audio Commands
Auto-tests &T
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
Caution:
The audio loop activation (enabled with AT&T1 command, disabled with AT&T2
command) involves some restrictions on the use of other AT commands.
• Audio loop mode must not be enabled when a communication is active.
• Audio loop mode must not be enabled when a tone is under generation.
• Audio loop must be disabled (if active) before opening a communication;
• Tone generation and sidetone modification must not be possible when the
audio loop is active.