Park the call and optionally announce it to an extension

The extension is supposed to point to a device which is in Auto Answer mode

The extension rings during timeout seconds and the extension to call hears the concatenation of prompts.

A specific Parked Extension prompt play the parking extension which must be called to retrieve the call

Timeout: [timeout]

First prompt: [prompt_1]

Second prompt: [prompt_2]

Third prompt: [prompt_3]

Fourth prompt: [prompt_4]

Latest prompt: [prompt_5]

Extension to call: [announce_ext]

Return extension: [extension_return]