AudioCodes Mediant 3000, User Manual

Page: 741 / 872

Version 6.6 741 Mediant 3000
User's Manual 53. Configuration Parameters Reference
Parameter Description
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 or 2.

[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: SIP T38 Version
[SIPT38Version]
Determines the T.38 fax relay version.

[-1 ] Not Configured = (Default) No T.38

[0] Version 0

[3] Version 3 = T.38 Version 3 (V.34 over T.38)
Note: For a description on V.34 over T.38 fax relay, see V.34 Fax
Support on page 175 .
Web: Fax Relay Enhanced
Redundancy Depth
EMS: Enhanced Relay
Redundancy Depth
[FaxRelayEnhancedRedunda
ncyDepth]
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 0.
Web: Fax Relay Redundancy
Depth
EMS: Relay Redundancy
Depth
[FaxRelayRedundancyDepth]
Defines the number of times that each fax relay payload is
retransmitted to the network.

[0] = (Default) No redundancy

[1] = One packet redundancy

[2] = Two packet redundancy
Note: This parameter is applicable only to non-V.21 packets.
Web: Fax Relay Max Rate
(bps)
EMS: Relay Max Rate
[FaxRelayMaxRate]
Defines the maximum rate (in bps) at which fax relay messages
are transmitted (outgoing calls).

[0] 2400 = 2.4 kbps

[1] 4800 = 4.8 kbps

[2] 7200 = 7.2 kbps

[3] 9600 = 9.6 kbps

[4] 12000 = 12.0 kbps

[5] 14400 = 14.4 kbps (maximum for T38 Version 0)

[6] 16800bps = 16.8 kbps

[7] 19200bps = 19.2 kbps

[8] 21600bps = 21.6 kbps

[9] 24000bps = 24 kbps

[10] 26400bps = 26.4 kbps