AudioCodes MP-26 series, User Manual

Page: 107 / 464

User's Manual 9. Configuring VoIP Parameters
Version 4.4.0 107 MP26x/MP27x
Parameter Description
Fax/Modem Bypass
Codec
Defines the codec for the VBD and Bypass modes. PCMA (default) or
PCMU.
G.711 64 kbps A-Law
-OR-
G.711 64 kbps u-Law
CED Transfer Mode

By Fax Relay: When the device is the receiver side, Switch to Fax relay
is enabled upon CED. This allows a high reliable fax-over-IP call
establishment at the beginning of CED tone.

In Voice Or PCM Bypass: When the device is the receiver side, to avoid
possible conflicts with low-speed modems, the CED (ANS) relay by
FoIP protocol may be disabled by setting the CED transfer mode to ‘In
Voice Or PCM Bypass’. In this case, the device does not initiate the Fax
Relay on detecting CED tone in absence of CNG, but switches to VBD
or remains in voice mode (depends on the Modem Transport Mode). the
device switches to FoIP later when it defines exactly that a monitored
call is the fax call (CED and CND or V.21 Preamble).
Enable CNG Detection Enables detection of the fax CNG signal. When the local fax machine
connected to the device receives a fax, the device switches to T.38 fax
relay upon detection of the CED signal from the local fax. If the local fax
machine sends a fax, the device switches to T.38 only after detecting the
CNG signal from the local side and the CED signal from the remote side. If
this check box is selected, the device switches to T.38 relay immediately
upon detection of the CNG signal from the local side, without waiting for the
CED signal from the remote side. The default is disabled.
Switch to Fax only by
the Answering Side When setting this parameter to "Enable", the device, as the fax sender, will
not send a T.38 Re-Invite and will wait for the answering side to initiate the
T.38 session.