1888usa.com: Lists free fax and phone resources on the web.
CentraNow: Web meetings powered by Voice over IP.
EtherVoice: Embedded Internet telephony gateway.
iBasis: Provider of wholesale international IP telephony services.
Inter-Fone - VoIP Internet Telephony: Internet-carried Phone to Phone calls.
Internet Telephony: America Is Waiting: FCC Chairman Kennard's remarks before the Voice Over Net Conference; Atlanta, Georgia; September 12, 2000.
InternetTelephony.com: Industry newsletter for telecom professionals.
IP Telephony Literature Survey: A literature survey covering architectural, protocol, and quality requirements for deploying an IP Telephony service.
IP xStream: IP Telephony data source.
Iscom, Inc. PCCall Service: PC to Phone call services.
NetYak: Web-to-phone call button for e-commerce.
Packetizer: Technical information about VoIP and videoconferencing.
RADVision: SIP, 3G-324M, H.323 stacks and testing tools for VoIP vendors.
SecureLogix Corporation: Provides enterprise telephony management systems.
TEK DigiTel Corporation: Provides communications solutions for the small to medium size business by integrating traditional PBX technology with data routing and VoIP technology.
Voice over Internet Protocol: An overview of VoIP from the Federal Communications Commission. With news, FAQs, factsheets, and findings.
Voice over IP and IP Telephony References: A directory of talks, papers, books, organizations, vendors, standards, web pages, and standards on IP telephony.
Voice Systems Research, Inc.: Provides unified messaging, voice mail, advanced call routing, and IP-based telephony solutions.
VOIP EZ: Offers in depth information on implementing VoIP in both consumer and commercial settings.
VoIP Watch: A weblog with news and reviews of VoIP products.
VoIP Wiki: A wiki that covers VoIP software, hardware, service providers, reviews, configurations, and standards.
VoIP.org.uk: UK resource with the emphasis on small businesses and home users. Includes news, reviews, and forums.
Wikipedia: Voice over IP: Encyclopedia article with background information, technical details, and the advantages and disadvantages of VoIP.