Mn (2,1) =0; Speaker always OFF.
=1; Speaker ON until carrier is detected.
=2; Speaker always ON.
=3; Speaker ON after last digit is dialed out until carrier detected.
*En (0) =0; Maintain non-error control connection when error control
handshake fails.
=1; Drop connection when error control handshake fails.
S22 Reserved.
S23 Bit-mapped register, default = 105
Qn (7) =0; Modem returns result code.
=1; Modem does not return result code. (See also S40b1)
Vn (6) =0; Display result code in numeric format. (See S35b7)
=1; Display result code in verbose format.
Xn (5,4,3) =0; Basic result code (0-4). (See result code table for ATXn)
=1; Result code (0-5, 10-21).
=2; Result code (0-6, 10-21).
=3; Result code (0-5, 7-21).
=4; Result code (0-21).
=5; Error control result code enabled.
=6; Error control result code enabled.
=7; Error control result code enabled.
&Pn (2) =0; Pulse dial make/break ratio=39%/61%.
=1; Pulse dial make/break ratio=33%/67%.
T (1) =0; Tone dial.
P =1; Pulse dial.
En (0) =0; Command echo disabled.
=1; Command echo enabled.
S24 Bit-mapped register, default = 138
Ln (7,6,5) =0-7; Speaker volume control.
Nn (3,2,1) =0-7; Ring volume control.
S25 Reserved.
S26 RTS/CTS Delay, default = 0
Sets the delay, in 10 millisecond units, between RTS and modem's CTS response in
synchronous mode. (See &Rn)
S27 Bit-mapped register, default = 156
*Qn (7,6) =0; No response to poor signal quality.
=1; Initiate retrain to poor signal quality. (See also S41b2)
=2; Adaptive rate (auto fall-back and fall-forward) when signal
quality changes.
=3; Disconnect when signal quality is poor.
&Hn (5,4,3) =0; Flow control disabled.
=1; Reserved.
=2; Reserved.
=3; Hardware CTS/RTS flow control.
=4; Software XON/XOFF flow control.
=5; Reserved.
&Kn (2,1,0) =0; No error control.
=1; MNP4 (includes MNP3, see also S41b0).
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