Route Prefixes Explained: How to Dial Standard, Premium CLI and ULTRA PREMIUM

A route prefix is a short code you dial in front of the international number to choose which route carries your call. Without a prefix your call uses the standard route.

The dialing format

[route prefix] + [country code] + [number]

No +, no 00, and no domestic leading zero.

More examples on ULTRA PREMIUM:

• Austria: 33333 + 43 + number
• Switzerland: 33333 + 41 + number

How to choose a route

• Standard — best price for everyday traffic.
• Premium CLI — for traffic where caller ID delivery matters. See Premium CLI vs standard routes.
• ULTRA PREMIUM — a separate premium line with its own rates per destination.

Where to see prices

In the portal, open Rates and pick the route tab. Use lookup by number to paste any number (with +, 00 or spaces — it is cleaned automatically) and see the matching prefix, price per minute and billing increment.

Billing increments

Each rate shows an increment such as 30/1: the first 30 seconds are charged, then every 1 second. Increments can differ by destination, so check them before sending traffic. See per-second billing explained.

Common mistakes

• Adding + or 00 after the prefix
• Keeping the domestic zero (0049… or 33333030…)
• Using a prefix on a trunk that is not enabled for that route

Related: Asterisk PJSIP setup, test CLI delivery.