gbmarks.com
Goodman's Book Marks: Telecommunications Services Information and More!
http://www.gbmarks.com/html/ip_telephony.html
Internet Telephony/H323/SIP (Session Initiation Protocol) Resources. VoIP Troubleshooter is a free online resource for network managers, providing background information and online diagnostic tools. ). SIP (Session Initiation Protocol) Forum. Voice over IP Calculator. From Ganymede Software, Inc. covering Voice over IP. Voice Over the Net). Virtual Voice Home Page. Provides international virtual numbers and VoIP origination services worldwide.). Broadband voice and videophone service provider.). Claritel...
dmoz.org
DMOZ - Business: Telecommunications: Services: VoIP
http://www.dmoz.org/Business/Telecommunications/Services/VoIP
Visit DMOZ on Facebook. Visit DMOZ on Twitter. Providers offering voice communication using VOIP (Voice over internet protocol). These services include PC-Phone, Peer to Peer, and analog-digital telephone adaptor services. Windows platform software-based IP PBX systems for small businesses. London/Cypress-based company. US-based (Georgia) VoIP services for B2C and B2B market. Adore Infotech Pvt. Ltd. Offers home and business service plans. Provides international VoIP call shop services. Includes FAQ.