CLI routes explained: call center, premium and standard

What CLI is

CLI (calling line identification) is the number shown to the person you call. It is carried in the call signaling and has to be valid for the call to be accepted by many destination networks.

Common route types

Carriers name their routes differently, so always ask what each name means for CLI handling and quality. A common breakdown is:

• Call center routes: built for high-volume dialer traffic and normally require a valid, routable CLI.
• Premium CLI routes: pass your CLI through to the destination, suited to enterprise and carrier traffic where the number must be displayed.
• Standard A-Z routes: lower-cost routes where CLI delivery may not be guaranteed.

Why valid CLI matters

Many destinations block or relabel calls with missing, invalid or unroutable numbers, and regulators in several countries require callers to present a number that can be called back. Using a number you do not own can also breach local law and your carrier agreement.

How to choose

• If the person called needs to recognise you, choose a route that passes CLI through
• If you run outbound campaigns, use a call center route with a valid CLI you own
• If CLI is not important and cost is, standard routes may be enough
• Test, then keep the route that gives the best answer rate for your traffic