SIP Trunking-Definitions
SIP is a networking term and stands for Session Initiation Protocol. A SIP Trunk is the way that a phone company delivers telephony services over data link.
Sip trunk connects business PBX (private branch exchange) to PSTN (public switched telephone network).
The actual trunk hardware carries the phone calls from the business site to the PSTN‚ [...]
http://video-news.find-best.biz/2012/05/12/sip-trunking-basics/
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