The core of the voice user experience is to make sure users find actual value in what is offered them.
The Core of Voice UX
Only if your assigned response to each and all questions scores at least 5 out of 10 then it would be worth the time and money to contact a professional voice app provider. You may use the same questionnaire for your RFP/RFI. Once you receive the written responses with numeric scores, you can compare them to your own internally prepared evaluation document to establish your way forward.