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Data Rate Management Type

•type1LocalGenerationOfTcf

– Type 1 data rate management requires that the Training Check Frame (TCF) training signal be generated locally by the receiving gateway. Data rate management is performed by the emitting gateway based on training results from both PSTN connections. Type 1 is used for TCP implementations and is optional for use with UDP implementations.
• type2TransferOfTcf (default)

– Type 2 data rate management requires that the TCF be transferred from the sending gateway to the receiving gateway rather than having the receiving gateway generate it locally.

Speed selection is done by the gateways in the same way as they would on a regular PSTN connection. Data rate management type 2 requires the use of UDP and is not recommended for use with TCP.

Low Speed Number of Redundant Packets

For low-speed fax relay, specifies the number of redundant IFP messages sent in a UDP for fax transmission. Possible values are 0, 1, and 2.

The default value is 1.

Max Bit Rate

Use this object to select the T.38 Maximum Bit Rate which controls and manipulates bits 11, 12, 13, and 14 in the DIS command received by the SBC from either the TDM circuit interface or the T.38 packet interface• 2.4 Kbps.

• 2.4Kbits_s – For modem type ITU-T V.27ter fallback mode.
• 4.8Kbits_s – For modem type ITU-T V.27ter.
• 9.6Kbits_s – For modem types ITU-T V.27ter and V.29.
• 14.4Kbits_s – (default) For modem types ITU-T V.27ter, V.29, and V.17. Use this setting to constrain the type of modem modulation schemes.

(See T.38 Max Bit Rate Handling for Non-Direct Handling Calls topic below for additional details)

Number of Redundant Packets

For high-speed fax relay, specifies the number of redundant Internet Facsimile Protocol (IFP) messages sent in a User Datagram Packet (UDP) for fax transmission. Possible values are 0, 1, or 2.

The default value is 1.

Specifies the T38 Protocol Version to be used. Options are:

• 0 (default)
  
• 3 (Used for SG3 (Super G3) call)