The settings are available only on IP500 V2 since it can terminate T38 fax. On the VoIP settings for the line type, Fax Transport Support must be set to T38 or T38 Fallback.
These settings are mergeable.
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Field
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Description
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Use Default Values
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Default = On.
If selected, all the fields are set to their default values and greyed out.
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T38 Fax Version
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Default = 3.
During fax relay, the two gateways will negotiate to use the highest version which they both support. The options are: 0, 1, 2, 3.
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Transport
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Default = UDPTL (fixed).
Only UDPTL is supported. TCP and RTP transport are not supported. For UDPTL, redundancy error correction is supported. Forward Error Correction (FEC) is not supported.
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Redundancy
Redundancy sends additional fax packets in order to increase the reliability. However increased redundancy increases the bandwidth required for the fax transport.
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Low Speed
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Default = 0 (No redundancy). Range = 0 to 5.
Sets the number of redundant T38 fax packets that should be sent for low speed V.21 T.30 fax transmissions.
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High Speed
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Default = 0 (No redundancy). Range = 0 to 5.
Sets the number of redundant T38 fax packets that should be sent for V.17, V.27 and V.28 fax transmissions.
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TCF Method
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Default = Trans TCF. TCF = Training Check Frame.
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Max Bit Rate (bps)
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Default = 14400.
Lower rates can be selected if the current rate is not supported by the fax equipment or is found to not be reliable.
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EFlag Start Timer (msecs)
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Default = 2600.
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EFlag Stop Timer (msecs)
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Default = 2300.
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Tx Network Timeout (secs)
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Default = 150.
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Scan Line Fix-up
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Default = On.
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TFOP Enhancement
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Default = On.
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Disable T30 ECM
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Default = Off.
When selected, disabled the T.30 Error Correction Mode used for fax transmission.
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Disable EFlags For First DIS
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Default = Off.
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Disable T30 MR Compression
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Default = Off.
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NSF Override
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Default = Off.
If selected, the NSF (Non-Standard Facility) information sent by the T38 device can be overridden using the values in the fields below.
Country Code: Default = 0.
Vendor Code: Default = 0.
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