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ISPhone Inc.
Wholesale voice over internet services. (infos)PC2call
PC-phone internet voice service provider based in the United Kingdom. (infos)
Mywebcalls
PC-Phone or device-to-phone United Kingdom based service. (infos)
Vonage
Provides voice over internet local dial-tone service. No PC required. Uses analog telephone with broadband telephone adapter. (infos)
Skype
Peer to peer internet voice service. Mac, Windows and Linux versions available. Users may call landlines and cellphones for a fee; users may call each other for free. (infos)
Packet8
Voice over internet direct dial service without a PC. Owned by 8X8, Inc. (infos)
Free World Dialup
Community network allowing calls to toll free numbers in the US, Japan, UK and Netherlands. Peer-peer calling to other members. (infos)
SIPphone Inc.
Peer-peer calling service. Requires SIP adaptor and phone. (infos)
Asterisk
An open source telephony switching and private branch exchange service. Allows peer-peer calling using a variety of voice over internet protocols. (infos)
Callserve
PC-to-Phone service for outbound calls only. Software download required. (infos)