TTY (Teletype) and the later term TDD (Telecommunications Device for the Deaf) is a technology used by the hearing impaired to communicate over the phone. In the USA support of TTY is required in some public places (call centers, hotels, etc).

Asterisk has some basic Alpha level code (as of December 2006) with support for TTY.
There is some additional information available at tdd mode. Asterisk svn trunk
has support for T.140 Real-time text and improvements on the TDD mode
in zaptel. TDD support is being developed in SIP too as well as a TDD gateway between
zaptel (analog devices) and SIP/T.140 realtime text in RTP.

See Also

Created by: admin, Last modification: Wed 29 of Sep, 2010 (18:35 UTC) by darmstrong
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