When i use m_Call.Speak() , it show "Can not initiate the TTS engine"

Q:I am trying to use speak method, this error fires:
Can not initiate the TTS engine.
I used the answering machine demo placing simple m_Call.Speak "text" in mTapiex_OnConnected sub.

A: You need to install Microsoft SAPI 4.0 and its engine, please visit our download page
in the "Additory download" session, download and install "Microsoft Speech API (SAPI) 4.0a " and "Microsoft Text-to-Speech Engine "