- Active Phone Server
 - Caller ID/answering machine application designed to manage your incoming phone calls. - Iscom, Inc.
- Offering international PC to phone services and virtual calling cards.
- Pingtel
- Developers of a Java-based voice-over-IP telephone for service providers and enterprises.
- VBuzzer
- Offering peer-to-peer Internet telephony software.
- wIPphone
- Provides hardware and software solutions for Internet telephony and voice over IP.
- 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.
- SIPquest
- Provider of SIP-based VoIP software modules and application components for telecom, datacom, OEMs, ISP/ITSPs and enterprise to enable IP telephony.
- Free World Dialup
- Allows users to make free phone calls over the Internet using a downloadable programme or a regular telephone connected to a computer network.
- TransNexus
- Provides a software platform for secure VoIP routing, CDR collection, and wholesale billing.
- ipVerse
- Makers of ControlSwitch, a carrier-grade software switch that can deliver voice-data communication services.
- Microsoft: Response Point
- Microsoft Response Point VoIP PBX phone system software offers small businesses scalable phone systems for up to 50 users. VoIP-enabled phone systems have built-in voicemail, auto attendant, speech recognition, call forward, and transfer.
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