Computer Telephony Integration
Computer telephony integration (CTI) is the technology that connects telephone systems — particularly the ACD — with computer systems, enabling screen pops, click-to-dial, call control from the desktop, and data exchange between telephony and business applications. In contact center operations, CTI is the bridge between the routing infrastructure and the agent workspace.
From a workforce management perspective, CTI impacts handle time (agents receive customer context before saying hello), adherence tracking (telephony state data synced to WFM systems), and real-time management (live agent state visibility).
Core Functions
Screen Pop
The most visible CTI function: when a contact arrives, customer information is automatically displayed on the agent's screen. Data sources include:
- Caller ID / ANI: Phone number lookup against CRM records
- IVR data passthrough: Account number, intent selection, and authentication status collected in the IVR
- CRM integration: Customer history, previous interactions, open cases
- Dialed number (DNIS): Which product line or campaign the customer called
Screen pops reduce AHT by 15-30 seconds per interaction by eliminating the need to ask for and manually look up account information.
Call Control
CTI enables agents to manage calls from their computer interface:
- Answer, hold, transfer, conference from the desktop
- Click-to-dial for outbound calls
- Warm and cold transfer with data passthrough
Agent State Integration
CTI synchronizes telephony agent states (available, on call, after-call work, not ready) with desktop applications:
- WFM platforms consume state data for adherence monitoring
- QM systems trigger recording based on state changes
- Reporting systems aggregate state duration for productivity analysis
Data Exchange
CTI passes data bidirectionally between telephony and applications:
- Inbound: Caller data → agent desktop → CRM (interaction record created)
- Outbound: CRM data → telephony (click-to-dial with account context)
- Analytics: Interaction metadata → analytics platforms for processing
Technology Evolution
- First generation (1990s): Hardware-based CTI links (Dialogic, CT Connect) connecting PBX to desktop
- Middleware era (2000s): Software CTI servers (Cisco CTI, Avaya TSAPI/JTAPI) providing API access
- Web/cloud era (2010s-present): WebRTC and cloud APIs (CCaaS) embed telephony directly in browser-based agent desktops, reducing CTI to an API integration layer
In modern CCaaS environments, CTI functionality is largely embedded within the platform — the screen pop, call control, and state management are native rather than requiring separate middleware.
See Also
- Automatic Call Distributor — Telephony system that CTI connects to
- Interactive Voice Response — Front-end system providing CTI data
- Contact Center — Operational environment
- Average Handle Time — Reduced by CTI screen pops
- Adherence and Conformance — Uses CTI state data
- Workforce Management Software — Consumes CTI data for adherence
- Contact Center as a Service — Modern platform embedding CTI natively
- Speech Analytics — Consumes CTI-linked interaction data
