Connecting Kerio Operator to CenturyLink


This topic is meant only for the CenturyLink IQ® SIPSession Initiation Protocol - A communication protocol used for voice and video calls in Internet telephony or private IP telephone systems. Trunk offer. CenturyLink supports only G.729 and G.711 U-law codecs.


To connect your Kerio Operator to the CenturyLink provider, you need the following information:

  • Your telephone numbers from CenturyLink. CenturyLink provides two types of numbers:
  • The SIP username (Trunk Pilot Number) and password (Trunk Group SIP Password).
  • The domain of CenturyLink (
  • The outbound and inbound proxies of CenturyLink (CenturyLink SBC IPv4 Address/Subnet Mask).
  • The registrar of CenturyLink (CenturyLink SBC IPv4 Address/Subnet Mask).
  • The authentication username (Trunk Group SIP ID).


  1. In the administration interface of Kerio Operator, go to Configuration > Call Routing > Interfaces and routing of incoming calls.
  2. Click Add SIP Interface.
  3. Key in a name for the interface.
  4. In the With external number field, key in the trunk or range of numbers and click Next.
  5. Select an extension to which you want Kerio Operator to redirect all calls to unassigned extensions.
  6. (Optional) In the Prefix to dial out field, key in a prefixCountry codes, area codes, a number, or a set of numbers that are dialed before the telephone numbers. for outgoing calls.
  7. Click Next.
  8. In the Domain (IP address/hostname) field, key in
  9. In the Username field, key in your Trunk Pilot Number.
  10. In the Password field, key in your Trunk Group SIP Password.
  11. Select the Required to register option and click Next.
  12. Select Edit details on the created interface and click Finish.

After you finish the configuration, the Edit External Interface (SIP) dialog box opens:

  1. In the Proxies and Registar section, key in your CenturyLink SBC IPv4 Address/Subnet Mask into Outbound proxy, Inbound proxy, and Registrar fields.
  2. Go to the Miscellaneous section.
  3. In the Authentication username field, key in your Trunk Group SIP ID.
  4. In the Read called number from field, select "To" header.
  5. In the Outgoing headers table: Double-click the value for From number and key in ORIGINAL_NUMBER.
  6. Enable the header.
  7. Double-click the value for P-Asserted-Identity and key in <>, where Trunk_Pilot_Number represents the number used for the SIP username.
  8. Click OK.