- From Voice: Call Opened
- From IVR: Play Voice File
- From IVR: Retrieve Digits
- From IVR: Drop Line
Are there any protocols that provide this kind of functionality?
VoiceXML will be adequate for the operations listed in your question. There are several IVR platforms that support this functionality, including Envox 6 -- the applications are created using VoiceXML and executed on the Envox 6 platform.
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