User's Guide for ZyXEL Omni 56K USB Modem
3-3
3.2 Protocol Support

n Data Physical Layer

. ITU-T V.90
. ITU-T V.34bis/V.34
. ITU-T V.32bis/V.32
. ITU-T V.22bis/V.22
. ITU-T V.21
. ITU-T V.23
. Bell 212A
. Bell 103

n Fax Physical Layer

. ITU-T V.17
. ITU-T V.29
. ITU-T V.27ter
. ITU-T V.21

n Error Control and Data Compression

. ITU-T V.42
. ITU-T V.42bis
. MNP3-5

n Command Set

. Standard Command set
. EIA Class 1 Fax Command set
. EIA Class 2 Fax Command set
. EIA Class 2.0 Fax Command set
. Basic AT Command set
. Extended AT& Command Set
. Extended AT* Command Set
. Extended AT# Command Set
. IS101 Voice Command set

For more information on detailed command sets, please refer to Chapter 5.