AudioCodes Mediant 800B - Page 1170

User's Manual 1170 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
Parameter Description
SIP T.38 Version
configure voip > sip-definition
settings > sip-t38-ver
[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:
 Interworking of T.38 Version 3 is supported only for Gateway
calls. For SBC calls, the device forwards T.38 Version 3
transparently (as is) to the other leg (i.e., no transcoding).
 For a description on V.34 over T.38 fax relay, see V.34 Fax
Support on page 201.
Fax Relay Enhanced
Redundancy Depth
configure voip > media fax-
modem > enhanced-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.
Fax Relay Redundancy Depth
configure voip > media fax-
modem > 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: The parameter is applicable only to non-V.21 packets.
Fax Relay Max Rate (bps)
configure voip > media fax-
modem > 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 (default)
 [6] 16800bps = 16.8 kbps
 [7] 19200bps = 19.2 kbps
 [8] 21600bps = 21.6 kbps
 [9] 24000bps = 24 kbps
 [10] 26400bps = 26.4 kbps
 [11] 28800bps = 28.8 kbps
 [12] 31200bps = 31.2 kbps
 [13] 33600bps = 33.6 kbps
Note:
 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.
 Fax relay rates greater than 14.4 kbps are applicable only to
V.34 / T.38 fax relay. For non-T.38 V.34 supporting devices,