ZyXEL Communications omni.net Plus - Manual (Page 115)

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Use command ATMn (n=0-3) to select when the speaker will be on or off. [S21b1-2]
AT Command Description
ATM0 Speaker is always off.
ATM1 Speaker is on during call establishment, but off when receiving carrier. (Default.)
ATM2 Speaker is always on.
ATM3 Speaker on after the last digit is dialed out and off when carrier is detected.
Table 58. AT Command for selecting speaker
Control Data Compression
Use command AT&Kn (n=0-3) to enable or disable data compression negotiation. The internal
fax/modem can only perform data compression on an error-corrected link. [S27b0-1]
AT Command Description
AT&K0 Disables data compression.
AT&K1 Automatic data compression (Default.)
AT&K2 Enables MNP 5 data compression.
AT&K3 Enables V.42 bis data compression.
Table 59. Control Data Compression AT Command
Fax Operation
The ZyXEL omni.net LCD+M supports the Group 3 sending and receiving facsimile function. You
must connect the modem to a computer, usually a PC. The computer is the input/output device for
the fax function. The interface between the modem and the computer is the normal RS-232 serial
connection. The modem uses the same interface for both data and fax applications. In fax operation,
it performs protocol handshaking and image data transfer, and the computer does the job of image
data creation, capturing, conversion, compression, decompression, retrieving, and storing. You can
send and receive fax by applying popular compatible fax packages such as Winfax or Microsoft
Fax.