How to make a popup contact card in your CRM?

Question

PHP

Tell me, please, on what technology (AJAX, WebSocket or something else) to make a pop-up contact card in CRM for an incoming call. For example, as in Bitrix 24 or amoCRM.

There is IP telephony that sends POST requests to the specified address when receiving and ending a call. The question is how to show the card and pass information to it.
The rest of the code is written in PHP

Answer 1

Web socket, forget about AJAX

Answer 2

I do it a little differently - a regular AJAX request to php files, which forms the div content for the pop-up card. On the example of a CRM with 25 employees, no braking was noticed