Returns one phone menu as an array holding the single menu, not a bare object. Only this read is enriched: managed_by is non-null when a call flow owns the menu, in which case writes to it answer 409, and replaced_by_flow is non-null when the menu was converted and a flow now serves its routing. Both come back null rather than erroring if the check cannot run. greet_long, greet_short, invalid_sound, exit_sound and ringback come back as sound references (an object such as {"type": "recording", "id": "…"}), or null when not set, in the same form a create or update takes.