User's Manual

Avaya Branch Gateway Manager 10.0 Page 249
15-601011 Issue 29r (Friday, November 02, 2012)B5800 Branch Gateway
Configuration Settings: Line
5.4.11.6 T38 Fax
The settings on this tab are only accessible if Re-invite Supported and Fax Transport Support are selected on the
VoIP tab.
Fax relay is only supported on IP Office Aura Edition systems with IP500 VCM, IP500 VCM V2 and or IP500 Combo
cards.
Usability
· Mergeable: These settings are not mergeable. Changes to these settings will require a reboot of the system.
Configuration Settings
· Use Default Values: Default = On.
If selected, all the fields are set to their default values and greyed out.
· T38 Fax Version: Default = 3.
The system can support Versions 0, 1, 2 and 3. During fax relay, the two gateways will negotiate to use the highest
version which they both support.
· Transport: Default = UDPTL (fixed).
Currently 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.
· Redundancy:
Redundancy sends additional fax packets in order to increase the reliability. However increased redundancy increases
the bandwidth required for the fax transport.
· Low Speed: 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.
· High Speed: 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.
· TCF Method: Default = Trans TCF.
TCF = Training Check Frame.
· Max Bit Rate (bps): 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.
· EFlag Start Timer (msecs): Default = 2600.
· EFlag Stop Timer (msecs): Default = 2300.
· Tx Network Timeout (secs): Default = 150.
· Scan Line Fix-up: Default = On.
· TFOP Enhancement: Default = On.
· Disable T30 ECM: Default = Off.
When selected, disabled the T.30 Error Correction Mode used for fax transmission.
· Disable EFlags For First DIS: Default = Off.
· Disable T30 MR Compression: Default = Off.
· NSF Override: 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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