Version 6.2
735
February 2011
SIP User's Manual
12. Configuration Parameters Reference
Parameter
Description
[10]
26400bps = 26.4 kbps
[11]
28800bps = 28.8 kbps
[12]
31200bps = 31.2 kbps
[13]
33600bps = 33.6 kbps
Notes:
The rate is negotiated between both sides (i.e., the device
adapts to the capabilities of the remote side). Negotiation of
the T.38 maximum supported fax data rate is provided in SIP’s
SDP T38MaxBitRate parameter. The negotiated
T38MaxBitRate is the minimum rate supported between the
local and remote endpoints.
Configuration above 14.4 kbps is truncated to 14.4 kbps for
non-T.38 V.34 supporting devices.
Web: Fax Relay ECM Enable
EMS: Relay ECM Enable
[FaxRelayECMEnable]
Determines whether the Error Correction Mode (ECM) mode is
used during fax relay.
[0]
Disable = ECM mode is not used during fax relay.
[1]
Enable = ECM mode is used during fax relay (default).
Web: Fax/Modem Bypass Coder
Type
EMS: Coder Type
[FaxModemBypassCoderType]
Coder used by the device when performing fax/modem bypass.
Usually, high-bit-rate coders such as G.711 should be used.
[0]
G.711Alaw= G.711 A-law 64 (default).
[1]
G.711Mulaw = G.711
μ
-law.
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
).
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