AudioCodes E-SBC

CHAPTER68 Configuration Parameters Reference
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
■ 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.
'Fax Relay Enhanced Redundancy Depth'
configure voip > media fax-modem >
enhanced-redundancy-depth
[FaxRelayEnhancedRedundancyDepth]
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] 0 = (Default) No redundancy
■ [1] 1 = One-packet redundancy
■ [2] 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
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 ECM Enable'
configure voip > media fax-modem >
ecm-mode
[FaxRelayECMEnable]
Enables Error Correction Mode (ECM)
mode during fax relay.
■ [0] Disable
■ [1] Enable (default)
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