Wholesale: Products & Services

Billing Information - IABS® (Integrated Access Billing System) - V25.0

NOTE: This document has been decommissioned effective January 30, 2017 and has been replaced with Billing Information – CABS (Carrier Access Billing System) - V1.0.

History Log


IABS is one of the systems CenturyLink™ uses to bill various products and services which are not billable via Customer Records and Information System (CRIS) or Billing and Receivable Tracking (BART) or any other CenturyLink billing system.

Some of the charges billed by IABS are:


CenturyLink products/services are offered in CenturyLink QC. To determine which products/services are available in which states, consult the Product Catalog (PCAT) for information.



Wholesale rates for this product or service, including tariff references and any applicable discounts, are provided in your current Interconnection, Resale, Commercial, or other governing agreement.

Cost Dockets are state-mandated rates, determined by each state Public Utilities Commission (PUC) or state regulatory agencies. You will be notified of Cost Docket rate changes when the rates in a specific Interconnection Agreement are updated. You can request a copy of the updated Interconnection Agreement from your CenturyLink Service Manager. You will be notified by a second notification at least 15 days prior to the implementation of the new rates in the CenturyLink billing system.

Tariffs, Regulations and Policies

Tariffs, regulations and policies are located in the state specific Tariffs/Catalogs/Price Lists.



If you are a new CLEC and are ready to do business with CenturyLink, view Getting Started as a Facility-Based CLEC or Getting Started as a Reseller. If you are an existing CLEC wishing to amend your Interconnection Agreement or your New Customer Questionnaire, you can find additional information in the Interconnection Agreement.


Pre-Ordering procedures are explained in the PCATS for the product or service you are ordering from CenturyLink.


Ordering procedures are explained in the PCATS for the product or service you are ordering from CenturyLink.

Billing Format

Your IABS bill and/or Customer Service Record (CSR) can be received in the following formats:

  • Paper
  • On-line Billing Service (OBS)/Terminal Access Interexchange Inquiry (TAXI) (Paper Image) via Dial-Up Modem. (This is view only; you will not receive anything with this format.) To sign up for TAXI, contact your Service Manager.
  • Internet (Web) – Bill/CSR data files are available for you to download via the CenturyLink Protected Internet Delivery (CPID).  You do not have the ability to view the bill files with the web media option.  (The files are available for download only). Abbreviated Paper Bill (you can specify which sections of the paper bill you would like to receive, in lieu of the entire bill).
  • Abbreviated Paper Bill (you can specify which sections of the paper bill you would like to receive, in lieu of the entire bill).
  • Network Data Mover (NDM) in BDT format.
  • File Transfer Protocol Secure (FTPS)

The IABS BDT format is created in Billing Output Specifications (BOS) Industry Guideline format. If for any reason IABS needs to deviate from this standard on the BDT, the deviations are documented on a Differences List. If you have selected the BDT format, refer to CenturyLink's BDT Differences List. In order to receive notification of changes affecting the Bill Data Tape (BDT) (i.e. yearly version updates) customers must subscribe to either the Systems or the CABS/BOS option thru the Notification Subscription tool on the Wholesale website.

CABS BOS is a Telecom Industry Guideline format, which is copyrighted and maintained by Telcordia. It is comprised of the following volumes:

  • SR 1869 - Vol. 1A - Codes and Phrases
  • SR 1871 - Vol. 2 - Service Exhibits
  • SR 1872 - Vol. 3 - Bill Data Tape
  • SR 1873 - Vol. 3A - Billing Data Tape Edits
  • SR 1874 - Vol. 4 - Data Elements

You must contact Telcordia directly in order to obtain the BOS documentation.  Contact information for Telcordia is available at http://www.ericsson.com/ourportfolio/telcordia_landingpage

For Resale - Frame Relay Service, three billing options are available to you:

  • Regular IABS Private Line which is non BOS Standard - Available in paper
  • IABS Summary Bill, which is non BOS Standard - Available in paper
  • Regular retail formatted bill option - Available in paper

The product you purchase may limit the billing options. Refer to the specific product for more information.


Overview of IABS Billing

When you submit a service request, CenturyLink generates one or more service orders, depending on the requested activity and/or service.

Upon completion of the service order(s) CenturyLink performs the following activities:

  • Updates your account in the databases to ensure that all information is current
  • Updates the CenturyLink CSR when the account is processed for billing
  • Rates each item on the order(s), based on tariff information and/or data from your Interconnection Agreement. Information is available in the state specific Tariffs/Catalogs/Price Lists.

IABS account bill dates are determined at the time the account is established. IABS generates appropriate recurring and non-recurring charges, per service order, for display on your monthly IABS bill.

Completed service orders are used to update your CenturyLink CSR. The CenturyLink CSR provides an inventory of elements that have a monthly recurring charge associated with them. IABS also receives usage data, which is used to generate Minutes of Use (MOU) charges, when this type of product has been established via a service order.

Each IABS bill is composed of various sections as follows:

  • Bill Common Header
  • Bill Identification Title
  • Balance Due
  • Detail of Current Charges
  • Detail of Payments
  • Detail of Other Charges and Credits (if applicable)
  • Detail of Adjustments (if applicable)
  • Detail of Usage Charges (if applicable)
  • Summary Totals section (if applicable)
  • Detail of Taxes

Bill phrases provide information for credits and/or charges that appear in either the "Detail of Other Charges and Credits" or "Detail of Adjustments Applied" sections of the bills. If you receive your bill in BDT format, a BOS bill phrase code will be provided. Refer to Telcordia BOS documentation, Volume 1A (SR 1869) for a list of standard bill phrase codes with the associated English text.

Billing Account Number (BAN) Assignment

BAN assignment is as follows:

  • Numbering Plan Area (NPA) - e.g., 303 (in Colorado)
  • Numeric Numbering Plan (NXX) - e.g., L08
  • Line Range - assigned based on available numbers within the range - e.g., 1234
  • Customer Code which is the last three digits of the line number - e.g., 234

This example of the BAN number would be 303-L08-1234-234 and would bill for the LIS Facility product.

The following table displays a list of all the BAN structures:

If the Product being billed is: Then your BAN is:
Resale - Frame Relay Service - Non-Carrier Meet Point Billing D07 0000-9999
Resale - Frame Relay Service - Non-Carrier Non Meet Point Billing D08 0000-9999
Resale Frame Relay Service - IABS Summary Bills

Note: The BAN format for the IABS Summary Bill always starts with SUM I and then is free flow for the next nine characters (often an abbreviation of the customer's name is used).

CCSAC/SS7 - Finished - Interconnect Port - Local Service L01 0000-6999

L01 8000-9999

LIS Usage/Trunking L04 0000-9999
LIS Facility L08 0000-5999

L08 7000-8699

L08 9000-9999

UDIT L08 6000-6999

L08 8700-8999

UDF L09 0000-6999
L09 8000-9999
Collocation - General Information - Recurring R59 0000-6999

R59 8000-9999

Access to Emergency Services (911/E911) for Facility Based CLECs

NOTE: E911 charges will appear on the CLEC's regular Access Private Line BAN. These charges do not have a specific assigned BAN range.

R40 0000-9999

R62 0000-9999

R72 0000-9999

R08 0000-6999 & 8000-9999

R81 0001-6999 & 9000-9999

The following table describes some commonly found types of charges that may appear on your IABS bill. (NOTE: You should refer to either your Interconnection Agreement or the tariff for applicable rates and calculations.)

Charge Basic Description
Additional Labor Charges Charges assessed when CenturyLink technicians are required to work overtime or outside normal working hours.
Cancellation Charges The charge applied when a requested service is cancelled the ordering process.
Customer Transfer Charges (CTC) CTC's are charges that apply in the following situations:
  • Converting a CenturyLink account to a CLEC Account.
  • Changing an end-user from one CLEC to another CLEC.
Expedite Charges The charge applied when a CLEC requests services in less than a standard time frame.
  • When service does not span an entire Bill Period (e.g. new connect or disconnect), the recurring charge is prorated to bill or credit from the date the service was installed or disconnected.
  • The prorating is calculated based on a 30 day Bill Period.
  • Calculation: Recurring Rate divided by 30 equals Daily Rate; Daily Rate times Number of Days in Service.
Interest Credits A credit assessed on money received in error or a deposit.
Late Payment Charges A charge assessed when payment for a bill is not received in a specified time frame.
Minimum Billing Period
  • The minimum period for which services are billed and for which rates and charges are applicable.
  • When a service is discontinued prior to the expiration of the minimum period, charges are applicable, whether the service is used or not.
  • Minimum Billing Periods may not apply to all types of products.
Non Recurring A charge that applies for work activity (e.g., an installation charge).
Out of Service Credits/ Adjustments Credits assessed when a circuit or service is not working, depending on the type of service.
  • Flat rated monthly charges that apply to each Bill Period.
  • Rates are either contracted or tariffed. For billing purposes, each Bill Period is based on 30 days.
Taxes & Surcharges Charges assessed or approved by a governing body on services or products provided.
Testing Charges Charges applied to provide a CenturyLink technician to perform network testing.
Usage Charges
  • Charges applied on a per Minutes of Use (MOU), a per call, or per query basis.
  • Usage is accumulated over a bill period.


General dispute process activities are described in the Billing Information - Dispute Process.

Rate Validation

CenturyLink has a process for validation of rates. When CenturyLink determines a billed rate correction is necessary, you will be notified by your CenturyLink Billing SDC at least 10-days prior to the correction being made. The 10-day window will begin when the CenturyLink Billing SDC sends a detailed Rate Change Notification form to you. The Rate Change Notification form will include information explaining the old and new rates, effective date of the correction, etc.

There are two different Rate Correction Notifications Forms that may be received depending on the product/service that is being corrected. The forms are as follows:

Bill Resend

There may be times when you wish to have a copy of a bill resent to you. To do this, you should contact your CenturyLink Billing SDC.

  • Resend of a paper bill will normally take between 2-10 days, depending on the type of product being billed.
  • Resend of alternate IABS bill media will take between 2-4 business days.

If you have not received the resent bill within the designated time, you should contact your CenturyLink Billing SDC.

A resend request made for the formats of NDM can only be accommodated for the current bill cycle. The request must be received by the CenturyLink Billing SDC prior to the date for the next month's bill. Any request made for a previous month�s bill, subsequent to the current month, will be sent on paper, regardless of the original media type.


Local CenturyLink 101 "Doing Business With CenturyLink"

  • This introductory web-based training course is designed to teach the Local CLEC and Local Reseller how to do business with CenturyLink. It will provide a general overview of products and services, CenturyLink billing and support systems, processes for submitting service requests, reports, and web resource access information. Click here to learn more about this course and to register.

If you have questions, you should call the telephone number provided on the Face Page of your IABS bill or your Billing SDC. You can also contact your assigned CenturyLink Service Manager for assistance.


If you have questions, you should call the telephone number provided on the Face Page of your IABS bill or your Billing SDC. You can also contact your assigned CenturyLink Service Manager for assistance.

Frequently Asked Questions (FAQs)

1. Can a dispute be issued verbally?
No, all billing disputes must be submitted in writing.

Last Update: January 30, 2017

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IABS® is a Trademark of CenturyLink™