- Convergys
 - Provider of outsourced, integrated customer management services. - AMDOCS Inc.
- Specialises in customer care and billing systems for network service providers, as well as publishing systems for telephone directory companies.
- Sitel Corporation (1)
- Billing World Magazine
- Magazine for service providers covering billing, OSS, customer care, and regulatory issues. Site also contains news, event information, classifieds, and reports.
- TheConsumerBridge.com
- Offers cost comparison service for Internet, phone, satellite television, and other telecommunication products.
- Auditel, Inc.
- Specialises in telephone bill audits and will negotiate a refund if an error is found.
- CSG Systems, Inc.
- Provider of customer management solutions for the communications markets.
- MaxBill
- Offers customer care, e-CRM, and billing, and electronic bill presentment and payment (EBPP) software systems.
- Martin Dawes Systems
- Provider of customer care systems for the telecoms and service provision industry.
- Telesoft Corporation
- Provides billing and customer care software and hardware to educational institutions, corporations, and government agencies.
- Usha Communications Technology
- Developer of billing and customer care software solutions for service providers.
- Daleen Technologies
- Provider of billing, customer care, event management, and rating software.
- Am Beo
- Real-time IP and Internet rating and billing solutions.
- Ryder Systems
- Bill and call management solutions for telecom companies and their customers.
- Macrologic, Inc.
- Billing and customer support solutions for telecommunications organisations worldwide.
- DST Innovis
- Provider of customer care and open billing solutions to the global communications and utilities industries.
- Payment One
- Offering outsourced billing and collection solutions for service and content providers, including phone billing capabilities.
- TransNexus
- Provides a software platform for secure VoIP routing, CDR collection, and wholesale billing.
- EUR Systems
- Inter-carrier and user billing, systems integration, and customer care for telecommunications carriers.
- Ace*Comm Corporation (1)
- Telesciences Inc. (1)
- Mid America Computer Corp.
- Offering comprehensive billing and customer care solutions for the independent telecommunications industry.
- Xtrasource
- International outsourcing company which provides technical support.
- Integretel Incorporated
- Offering outsourced billing and collection services through the local phone bill, a direct bill, or an online bill.
- Switch Management Corp.
- Offers telecom carrier billing for international telecom carriers.
- International Billing Services
- Provider of statement processing solutions including billing and statement production, electronic billing, design, and statement viewing and archiving.
- Intouch Management Services
- Billing, programming and management systems for pcs/paging carriers and resellers.
- GlarNet Communications Services
- Provider of outsourced registration, billing, payment processing, and customer care services for ISPs, ASPs, telecom, and wireless companies.
- Open International Systems
- Offers software solutions for telecommunications and utilities companies, with an emphasis on customer care, BSS, OSS, billing systems, and provisioning.
- eMerging Information Systems, Inc.
- Provides billing and customer care software for utilities, service providers, mobile telephony, and other communication industries.
- Centech Solutions
- International call centre consulting firm, specialising in call centre technology, customer satisfaction measurement, outsourcing, and customer service.
- Sysnet Telecomm. and Billing System
- Billing platform designed for the telecommunications industry.
- Switch Solutions, Inc.
- SSI provides integrated billing and customer care software solutions for telecom providers and related services worldwide through license, lease and service bureau agreements.
- TransMedia Billing
- Billing services, including direct bills with rating or monthly recurring, taxing, compliance, lockbox payments, and collections management for Internet, telecom, audiotext, home security, and more.
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