GAO T.30 software implements ITU-T T.30 Recommendation, which is procedures for document facsimile transmission in the general switched telephone network.
GAO T30 software is targeted for fax application as fax handshaking protocol. It will establish and manage communications between two fax modems. There are five phases of operation covered: call set up, pre message procedure (selecting the communication mode), message transmission (including phasing and synchronization), post message procedure and call release.
GAO T30E software implements the procedure for the Group 3 (G3 fax) document facsimile transmission of continuous-tone color images. With T.30E, it will enable the efficient transmission of high quality, full color and gray-scale images over the general switched telephone network and other networks.
For information on Fax Relay, please see GAO's Fax Relay Software.