Introduction

Use the following parameters to configure the gateway with Fax settings.

FAX Settings

ParameterDescription
Use-T38-For-FAX

Default is True.

If disabled, G711ulaw is used to send and receive faxes.

Fax-Bit-Rate

Default is 14400 bps. Choose a rate from the Fax Bit rate (bps) drop-down list.

This field specifies the data rate that the fax machine support. 

Note: Super G3/G4 Fax is not supported.

Fax-TCF

Default is Local. Choose the data rate management method for the Training Check Function (TCF) signal.

Data rate management is carried out by the emitting gateway, which takes the T30 data and encodes it into T38 packets, port 1 or 2, based on training results from local and remote FAX terminals. This method is used for TCP connections and is optional for UDP.

  • Local—Requires that the TCF training signal is generated locally by the receiving gateway, which receives the T38 data and translates it into T30 data, port 1 or 2.
  • Transferred—Requires that the TCF signal is transferred from the emitting gateway to the receiving gateway. In this case, the speed selection is carried out by the G3FEs in the same way as a PSTN connection. This method is mandatory for UDP.
Fax-Options

Default is none. Choose special settings for the fax machine:

None- No special settings selected. 

  • BitRemoval—Fill bits can be inserted or removed in the Message Transmission Phase C, non-ECM data to reduce bandwidth in the packet network.
  • TransMMR—Conversion between Modified Modified READ (MMR) T.6 and the line format to increase data compression and reduce bandwidth in the packet network.
  • JBIGTranscoding—Joint Bi-level Image Experts Group (JBIG) T.30 provides the ability to convert to/from JBIG to reduce bandwidth.
UDP-Max-BufferDefault is 1024. The range is 200 to 4096 octets. Enter the maximum number of octets that can be stored on the remote device before an overflow condition occurs. 
UDP-Max-Datagram-SizeDefault is 256. The range is 200 to 512 bytes. Enter the maximum size of a UDP Transport Layer (UDPTL) packet or the maximum size of the payload within an RTP packet that can be accepted by the remote side. 
Fax-Error-Correction

Default is Redundancy. Choose the error correction method used by the fax machine.