Your logical point of integration would be IPIVR. You would need to have external TTS server though, no such capability within UCCE solution components. IPIVR side of configuration is found under Subsystems>MRCP TTS.
You don't need TTS to read back numbers associated with time in queue.
You need TTS if you are trying to announce to the caller something more abstract, like the caller's address retrieved from a database. But for numbers, time of day, dates, currency etc. there is enough structure in the system to build prompts that announce the required data without using a Text To Speech server.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...