Dialogic 6.2 manual Processing Media Using the T.38 Protocol, November 238

Processing Media Using the T.38 Protocol

Processing Media Using the T.38 Protocol

The Brooktrout SDK supports real-time sending and receiving faxes over IP following the T.38 protocol for exchanging messages and data through IP fax gateways or IAF devices over an IP network.

Because Brooktrout’s Bfv Call Control API uniformly supports a wide set of transports including IP, you can use the same fax functions for fax over IP as when sending faxes over the PSTN. You can configure your system using the Brooktrout Configuration Tool (a GUI product) or by editing user-defined files.

Using standard fax machines over the PSTN, the following information is presented.

„ The sender of a fax gets immediate notification of a fax being

	sent successfully.
	„ The receiver gets information on the sender’s telephone number
	and the time the fax was received.
	Bfv’s IP fax support provides this information as well.
	Traditionally, faxing has been done over the TDM telephone
	network, as defined in the ITU specification T.30. In a traditional
	PSTN based T.30-only fax transmission, sending a fax requires three
	fax components:
T.30 Protocol Engine	While T.30 is a mature technology, an effective T.30 implementation
	is complex due in large part to the challenge of connecting with the
	installed base of 120 million fax machines whose own compliance to
	the standard varies considerably.
Image Conversion Engine	The sending device must adapt (scale and transcode) the image to
	the capabilities of the receiver. The receiver must check the received
	file for errors and try to correct ones that occur.
Modem	This is the vehicle to carry the protocol and image data across the
	PSTN network.

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