What it is
Push-to-talk voice messaging with text and photos alongside. Messages play back live if both people are there and wait patiently if not.
Best for
Selling asynchronous access as a product. "Voxer support Monday to Friday" is a legible, priceable offer that costs far less of your calendar than adding calls.
Watch out for
Unbounded voice access becomes unbounded work. State your hours and your response time in the agreement, or the package quietly turns into being on call.