A fair exchange

Clark, Toby
June 2010
Commercial Motor;6/17/2010, Vol. 212 Issue 5386, p44
Trade Publication
The article offers information on IP (Internet Protocol) telephony. Voice over IP (VoIP) services enable users to make voice calls that can be sent via a single line simultaneously, cutting the cost of each call substantially. Another stage in IP telephony is the SIP trunk, which is a digital phone line connecting VoIP calls to the regular phone network. Voiceflex and Gamma Telecom are two major suppliers of SIP trunks in Great Britain.


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