If the creator has the app (onair.io/ios , onair.io/android), they would receive notifications there and can take the call. Also, if a browser is open when someone calls them, they would also receive notifications there as well.

Is there a way the creator can mark their availability on the app? May be on a calendar?

Yes. You can set yourself `always online`, or `always offline`, or `scheduled`. In the last one, you specify hours in the day (e.g. 9am-5pm), and sync with external calendar (currently Google Calendar) which marks you as offline when you're busy.

A few:

- assign calls to different members (round-robin, escalation)

- capture lead info (name, email, etc)

- don't reveal actual phone number

- recording, transcription

- soon, conversational AI agent (as optional backup)

With a WhatsApp/phone, you can't really switch it from one employee to another easily. Managing load is harder, seeing call logs is harder. And a full call center solution is too much for a small business.

You can overcome this using headers, which instructs Gmail not to cache. Snippet:

response.headers["Cache-Control"] = "no-cache, no-store, max-age=0, must-revalidate"

response.headers["Pragma"] = "no-cache"

response.headers["Expires"] = "Fri, 01 Jan 1990 00:00:00 GMT"

You might want to investigate this further - IIRC a lot of email services retrieve images in advance server side to avoid leaking whether the client has interacted with the email. I might be mistaken here.