ATM<0,1,2,3>
0 - speaker is off
1 - speaker is on until modem detects the carrier signal
2 - speaker is always on while modem is off-hook
3 - speaker is on until the carrier is detected, except when dialing
[ITU-T Recommendation V.250 (05/99)]
[ 14-01-2003: Edited by: AMiGo ]</p>
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