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Host-Based Controller Modem Data Addendum
AT Command Set June 15, 1998
AT Command Reference (continued)
Lucent Technologies Inc. Version 1.0
10
20. Reason for call ending, only valid after call ends:
0 = Local modem command: ATH, DTR drop
1 = Remote modem: cleardown, loss of signal
2 = No answer, busy, etc.
3 = Training failure V.90, K56flex or V.34.
4 = Protocol failure if required by \N4, for example.
21.
For PCM connection only, a hexadecimal 6-bit pattern of T1 frames with robbed-bit signaling.
22.
For PCM connection only, the downstream digital loss.
23.
For K56flex connection only, the V.8bis info sent by the server. Meaning is defined at the server and by
convention. Example above is from a recent Ascend MAX in µ-Law.
Ln Monitor Speaker Volume
This command sets speaker volume to low, medium, or high.
L0: Selects low volume.
L1: Selects low volume.
L2: Selects medium volume (default).
L3: Selects high volume.
Result Codes:
OK n = 0, 1, 2, 3
ERROR Otherwise
Mn Monitor Speaker Mode
This command turns the speaker on or off.
M0: The speaker is off.
M1: The speaker is on until the modem detects the carrier signal (default).
M2: The speaker is always on when modem is off-hook.
M3: The speaker is on until the carrier is detected, except while dialing.
Result Codes:
OK n = 0, 1, 2, 3
ERROR Otherwise
Nn Modulation Handshake
This command controls whether or not the local modem performs a negotiated handshake at connection time with
the remote modem when the communication speed of the two modems is different.
N0: When originating or answering, this is for handshake only at the communication standard specified by
S37 and the ATB command.
N1: When originating or answering, begin the handshake only at the communication standard specified by
S37 and the ATB command. During handshake, fallback to a lower speed may occur (default).
Result Codes:
OK n = 0, 1
ERROR Otherwise