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5 See also
Asterisk PBX
The popular Linux-based open source software PBX switch
Free World Dialup
A SIP-based free VoIP network.
SIPphone
A SIP-based free VoIP network.
Skype
Proprietary VoIP system which uses a messenger-like client.
PhoneGaim
, a
free
VoIP system based on
GAIM
and SIP.
Yate
, a
free software
VoIP telephony engine (VoIP server and client for H.323,IAX,SIP)
6 Related Concepts
Integrated Services
Differentiated Services
Computer Conferencing
Predictive dialers
7 External links
Wiki about VoIP
VoIP Now
news weblog devoted to VoIP
VoIP overview
: An schematic overview of VoIP and technical difficulties
Internet Telephony Magazine
online resource for learning about VoIP
Telecommunications
telephony
Voice over IP
Non User