ZyXEL Communications U-336SA - Manual (Page 17)

Introduction 3
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Extended AT command set with V.25bis.
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Operates on 2-wire dial-up or 2-wire leased line.
Intelligent Features
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Automatic data and voice call detection allows you to use a single
telephone line to handle both types of calls.
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Asynchronous and synchronous modes for reliable serial data
communication.
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Fast retrain with automatic fall-forward and fall-back. Your modem
will automatically fall back to lower speeds when communicating
with slower modems and when encountering unstable or variable
line conditions.
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Call-back security and password protection restricts access to
authorized callers only.
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Caller ID identifies incoming calls before you answer (you must
subscribe to this service through your telephone company in order
for your modem to identify callers).
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Distinctive ring detects data and voice calls (this feature requires
communication software that supports distinctive ring, such as
ZFAX)
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Remote configuration capability.
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EDR (extended Distinctive Ring).
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Flash EPROM memory lets you easily upload new firmware,
providing you with easy access to new features.