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An IVR Designer application can speak prompts and announcements in prerecorded speech only, TTS only, or a combination of prerecorded speech and TTS.
For example, in one application, recorded speech is used for all phrases except the customer's name. TTS allows the system to speak the contents of a "cust_name" variable, which contains the customer's name as a character string. To have this name spoken without TTS, you would have to record every possible customer name, save the phrase tag numbers of each, and associate the phrase tag number with the customer account number. Then the system would speak the phrase tag number corresponding to the customer's account number.
Furthermore, each time you add a customer's name to the list, you would have to update your application, record the new name, recompile your application, transfer, and reinstall it on the Avaya IR. Obviously, this would involve a huge amount of work just to maintain the names in the system. In cases like this, it might make more sense to use TTS to speak the customer's name.
