ZyXEL Communications Omni TA128 - Manual (Page 64)

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support out-of-band signaling, network signals are transmitted
through the B channels. This reduces the bandwidth to 56Kbps.
When you are making a V.120 call, make sure that the
communication supports out-of-band signaling. If it does not
support out-of-band signaling, you will need to set your TA128 to
56K mode using the AT&E1 command (AT&E0 to set it back to
64k mode.) If your TA128 is on the receiving end, you can keep the
setting at AT&E0, 64k data mode. The TA128 will automatically
switch between the two speeds in answer mode.
Configuring the V.120 mode
To configure for a 56K V.120 call, type:
ATB20 (Select V.120 for communication)
TA128 responds:
OK
Type:
AT&E1 (Select 56K data mode)
TA128 responds:
OK
Now you are ready to dial the phone number. If you need to save
the setting into non-volatile RAM, issue the commands:
Type:
AT&W0 (Save the settings to profile 0) [Profiles available: 0-
3]
TA128 responds:
OK
Type:
ATZ0 (Save stored settings as the power on settings to profile
0) [Profiles available: 0-3]
TA128 responds: