App_Cepstral is a TTS application utilizing the Cepstral TTS Engine to produce text to speech without swaping to file for the actual audio.
Both versions for Asterisk 1.2 and 1.4 are available.
Note: the Asterisk 1.4 link is dead
The successor is the version 1.8 as a complete rewrite.
App_Cepstral v1.2 (c)2006 Anthony Minessale II <[email protected]>
App_Cepstral v1.4 (c)2007 Anthony Minessale II <[email protected]> & Brian Fertig <[email protected]>
App_Cepstral v1.8 (c)2011 Jörg Bernau <[email protected]>
Cepstral is not free. You must purchase a license.