About Ring central Click to dial feature

Hi,

I want to implement click to dial feature of ring central with my web application

when i click on the phone number with url like href="tel:{PhoneNumber}" Or href="callto:{PhoneNumber}" then it is asking to choose the application for calling but ring central is not appearing as an option

I have tried with desktop as well as ring central google extension but it is not showing in the calling options

Can you please provide any documentation link or any guide on click to dial feature?