Reload the IP Office configuration into IP Office Manager and check that the status of the license has changed to Valid.
The Voicemail Pro installation includes the default Microsoft TTS engines (Microsoft Sam, Mike, Mary and Simplified Chinese) as standard. If another third-party SAPI 5 compatible TTS engine is going to be used, install that software.
Open the Control Panel and click on Speech.
Select the Text to Speech tab.
The installed TTS engines should be listed. Adjust and test the setting to obtain the speech required.