The voicemail service can use text-to-speech (TTS) for several functions:
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Automatically provide an entry prompt for actions using the action’s description text.
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Add spoken prompt’s during a call flow using Speak Text actions.
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Perform email reading.
The speech engines used for TTS are provided as follows:
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Locally installed – Using services installed on the same server as the voicemail service.
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Google speech – System using subscription mode can be configured to use Google speech services to provide TTS. This overrides any local TSS service.
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The Google speech service also provides the voicemail service with support for a number of automatic speech recognition features.
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