Integration of Free PBX into Zoho CRM

Hi, my intention is to integrate my VoIP system on Free PBX into Zoho CRM to allow my consultants to make calls to leads with click to call. Also when a call comes in to my azeinda, if the caller is already present in Zoho CRM, I would like the corresponding contact card to open, so that my employees can immediately get all the information of the contact who is calling me. I therefore ask you to indicate the time and cost for the integration, in addition to the single or recurring cost to be incurred for any plugins or external services needed. Thank you