Add features to a web chat

Hi We have a WordPress Freelancer site using this theme from themeforest : Workreap It connects Freelancer & Employer with a chat during negotiation & project. The theme has option to use Cometchat go. We purchased a license but cometchat doesn't work in our targeted country. (messenger doesn't load) The theme also has a built-in chat (Node I believe) that needs to run a [login to view URL] file to be real-time. Since built-in chat is integrated with system, I guess the best way is to add features to built-in chat, but we're open to suggestion. The built-in chat only has text chat + file sharing + emoji. We like to add these features to it: 1. Audio Call 2. Video Call 3. Screen Sharing We are open to use any resources that reduce the cost and time of project. like this one: [login to view URL] or any resources you think is the best choice. ------------------------------------------------ PHASE 2 The built-in chat only loads in a special page in user panel. We also need a Docked version to comes in bottom of all pages (for logged-in). If a complete chat window for docked version is too hard at least we need a messenger so user knows when someone sent a text message or call. Please let me know how much time and budget each phase needs. I attached screenshots and I can demo both versions if you needed (cometchat & theme built-in chat). Thanks