SIP User's Manual 414 Document #: LTRT-65415
MediaPack Series
Parameter Description
Web/EMS: CNG Detector Mode
[CNGDetectorMode]
Determines whether the device detects the fax Calling tone
(CNG).
[0] Disable = The originating device doesn’t detect CNG; the
CNG signal passes transparently to the remote side
(default).
[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 per IP Profile,
using the IPProfile parameter (see ''Configuring IP Profiles'' on
page 122).
Web: Fax/Modem Bypass Packing
Factor
EMS: Packetization Period
[FaxModemBypassM]
Number of (20 msec) coder payloads that are used to generate
a fax/modem bypass packet.
The valid range is 1, 2, or 3 coder payloads. The default value is
1 coder payload.
[FaxModemNTEMode]
Determines whether the device sends RFC 2833 ANS/ANSam
events upon detection of fax and/or modem Answer tones (i.e.,
CED tone).
[0] = Disabled (default).
[1] = Enabled.
Note: This parameter is applicable only when the fax or modem
transport type is set to bypass or Transparent-with-Events.
Web/EMS: Fax Bypass Payload
Type
[FaxBypassPayloadType]
Determines the fax bypass RTP dynamic payload type.
The valid range is 96 to 120. The default value is 102.
EMS: Modem Bypass Payload
Type
[ModemBypassPayloadType]
Modem Bypass dynamic payload type.
The range is 0-127. The default value is 103.
EMS: Relay Volume (dBm)
[FaxModemRelayVolume]
Determines the fax gain control.
The range is -18 to -3, corresponding to -18 dBm to -3 dBm in 1-
dB steps. The default is -6 dBm fax gain control.
Web/EMS: Fax Bypass Output
Gain
[FaxBypassOutputGain]
Defines the fax bypass output gain control.
The range is -31 to +31 dB, in 1-dB steps. The default is 0 (i.e.,
no gain).
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