What is Computer Telephony Integration (CTI)?
Computer telephony integration (CTI) is technology that connects a phone system to business software, so calls can be placed, answered and logged from within an application such as a CRM rather than on a handset.
In practice CTI is what turns a phone number in your CRM into a clickable link, shows you who is calling before you answer, and writes the call back into the customer record afterwards without anyone typing it in.
The connection runs over an API between the phone platform and the application. When a call arrives, the platform passes the caller ID to the CRM, which looks up the matching record and opens it — the screen pop. When the call ends, duration, direction, outcome and any recording are written to that record automatically.
The practical argument for CTI is not the click-to-dial convenience. It is that call activity stops depending on whether a busy person remembers to log it. Teams that rely on manual logging typically capture a fraction of calls, which makes pipeline and activity reporting unreliable in a way that is invisible until someone audits it.
CTI predates cloud software — it began with on-premise PBXs wired to desktop applications in the 1990s, which is why the term sounds dated. The mechanism is the same; only the transport has changed, from proprietary middleware to HTTPS and OAuth.
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