What is Calling Line Identity (CLI)?
Calling Line Identity (CLI) is a telephony feature that transmits the caller’s number to the receiving party. It’s often used to identify, route, or log calls, particularly in enterprise and call center environments.
CLI vs. Caller ID
CLI is typically set by the network provider and is harder to spoof than traditional Caller ID, which can be blocked or manipulated by end users. CLI is more reliable for internal call handling and authentication.
Types of CLI Use Cases
Outbound Branding
Use CLI to display a consistent business number across all calls.
Inbound Routing
Route calls based on incoming CLI to specialized queues.
Regional Routing
Match CLI to local numbers to increase pickup rates.
Best Practices for CLI
– Maintain consistent outbound numbers for brand trust
– Monitor CLI presentation and configuration
– Ensure CLI is compliant with local telephony regulations
– Use CLI suppression or masking where needed for privacy
Related Topics for Further Reading
– ANI
– Caller ID
– Outbound Call
– Call Routing
– Predictive Dialer
