The Mobicents Text To Speech (TTS) Resource Adapter provides easy-to-use interface to state-of-the-art speech technology. TTS RA makes use of FreeTTS  which is speech synthesis system written entirely in the Java programming language. However FreeTTS supports only a subset of the JSAPI 1.0 javax.speech.synthesis specification. 

The class diagram looks like

 TTS RA is capable of producing the audio files which can be used by Media Player RA to open outbound RTP media stream and transmit the speech to SIP Client.

The use case can be extend IVR Bank Demo example where IVR asks user to enter his/her account number and password. After successful verification of account and password the Service retrieves the account balance from database. Service passes this balance as text to TTS RA which produces the audio file that is used by Media RA to transmit to SIP Client.