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Prefix Sets

Setup Advanced Prefix Set

A Prefix Set groups one or more prefixes in a predefined group. When configuring specific customers or users, the predefined group can be used, simplifying the configuration. ConnexCS supports plain text as well as regular expressions when building Prefix Sets for greater flexiblity.

Create Prefix Set

  1. Click the .
  2. Name the set.
  3. Data includes the prefixes, one per line (plain-text or regular expressions).
  4. Click Save.

Apply Prefix Set

Prefix Sets can be applied to the following locations under the Management menu:

Customer Routing Ingress Routing Basic Dial String Prefix Set

Routing Routing Global Basic Dial String Prefix Set

Rate Card Customer Rate Cards Profits Config Prefix Set


Use Flags to create a Global CLI Blacklist or a Global Dialled Number Blacklist (Aka Block List). This will prevent all calls going through the system which match the defined prefix set.

Blacklist or Do Not Call list

Flags are used for large amounts of numbers that change infrequently. If you are looking to manage a DNC list, take a look at our Do Not Call (DNC) setup.

Example Dial Strings for Prefix sets

Prefix Sets, as well as all Dial String fields, accept plain text or regular expressions. List only one prefix per line. Here are 3 samples, using plain-text, regex, or a mix:



Regular Expression (RegEx)


Combination (UK Landline & Canada)