- Portal Software
 - Provides flexible billing and subscriber management solutions to enable organisations to monetize their voice and digital transactions. - United Support Systems
- Billing and subscriber management software for Internet, telecommunications, and cable television companies.
- Danet, Inc.
- Provides invoicing and customer care solutions, specialising in the telecommunications industry.
- Mind CTI
- Develops, manufactures, and markets real-time billing and customer care software for Voice-over-IP service providers.
- webVoIP
- Develops integrated Voice Over IP billing applications, including debit card, gateway to gateway IP relay, gateway-to-gateway billing, NOC, and real-time monitoring products.
- Info Directions, Inc.
- Integrated rating, billing, and customer care software for the telecommunications industry.
- CTI Group
- Provider of enterprise telemanagement and billing systems.
- ARIS
- Suite of customer care, billing, POS, and financial software for the wireless telecommunications industry.
- Bluespring Software
- Offers an enterprise-wide suite of business and operational support system software for communications service providers.
 Cerillion Technologies
- A convergent billing and customer relationship management system for fixed wire, mobile, and IP communications service providers .- Communications Software Consultants, Inc.
- Providing convergent billing software for independent telephone and cellular companies.
- Sentori, Inc.
- Offers integrated billing, customer care, and mediation software solutions for communications providers.
- CommTech Corporation
- Enables end-to-end flow-through provisioning by providing order management and service activation.
- Jones Cyber Solutions, Ltd
- Customer care and billing software.
- Vitel Software, Inc.
- Developer of telemanagement software products for voice mail management, telecom bill management and other applications.
- Aptis, Inc.
- Internet and telephony billing and customer care solutions provider.
- Abiliti Solutions
- Provides Windows NT based customer care and billing software for the telecommunications industry.
- CCI Software Corporation
- Providing accounting, wholesale distribution and secondary market software to the telecommunications industry.
- eMerging Information Systems, Inc.
- Provides billing and customer care software for utilities, service providers, mobile telephony, and other communication industries.
- BeQuick Software
- Offers billing, repair and order management, customer and agent care, agent invoicing, and bill reconciliation in one OSS software package for competitive local exchange carriers.
- Telecommunication Operating System Solutions LLC
- Offers software to manage orders, workflow, telephone numbers, and more.
- Super Sonic Systems
- Billing and management software for pager and cellular resellers.
- Communication Software Specialties
- Provider of an extensive family of telecommunication related software products used by telephone companies, common carriers, LEC, CLEC, IXC, and ISPs. Billing, rating, customer care, AMA, and EMI.
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