AudioCodes Media Pack MP-11x, User Manual

Page: 566 / 650

User's Manual 566 Document #: LTRT-65432
MP-11x & MP-124
Parameter Description
EMS: Bell Transport Type
[BellModemTransportType]
Determines the Bell modem transport method.

[0] = Transparent (default)

[2] = Bypass

[3] = Transparent with events
Web/EMS: Fax CNG Mode
[FaxCNGMode]
Determines the device's handling of fax relay upon detection of
a fax CNG tone from originating faxes.

[0] Doesn't send T.38 Re-INVITE = (Default) SIP re-INVITE
is not sent.

[1] Sends on CNG tone = Sends a SIP re-INVITE with T.38
parameters in SDP to the terminating fax upon detection of a
fax CNG tone, if the CNGDetectorMode parameter is set to
1.
Notes:

This feature is applicable only if the IsFaxUsed parameter is
set to
[1] or [3].

The device also sends T.38 re-INVITE if the
CNGDetectorMode parameter is set to
[2], regardless of the
FaxCNGMode parameter settings.
Web/EMS: CNG Detector Mode
[CNGDetectorMode]
Determines whether the device detects the fax calling tone
(CNG).

[0] Disable = (Default) The originating device doesn’t detect
CNG; the CNG signal passes transparently to the remote
side.

[1] Relay = CNG is detected on the originating side. CNG
packets are sent to the remote side according to T.38 (if
IsFaxUsed = 1) and the fax session is started. A SIP Re-
INVITE message isn’t sent and the fax session starts by the
terminating device. This option is useful, for example, when
the originating device is located behind a firewall that blocks
incoming T.38 packets on ports that have not yet received
T.38 packets from the internal network (i.e., originating
device). To also send a Re-INVITE message upon detection
of a fax CNG tone in this mode, set the parameter
FaxCNGMode to 1.

[2] Events Only = CNG is detected on the originating side
and a fax session is started by the originating side using the
Re-INVITE message. Usually, T.38 fax session starts when
the ‘preamble’ signal is detected by the answering side.
Some SIP devices don’t support the detection of this fax
signal on the answering side and thus, in these cases it is
possible to configure the device to start the T.38 fax session
when the CNG tone is detected by the originating side.
However, this mode is not recommended.
Note: This parameter can also be configured in an IP Profile.
Web: Fax Relay Enhanced
Redundancy Depth
EMS: Enhanced Relay
Redundancy Depth
[FaxRelayEnhancedRedundancy
Depth]
Defines the number of times that control packets are
retransmitted when using the T.38 standard.
The valid range is 0 to 4. The default is 2.