What is SIP Trunking?
Trunking refers to the means used to transport inbound and outbound calls between the enterprise and external entities (including branch offices and other remotely located parties such as business partners, customers, and suppliers). The differences between traditional trunks and SIP trunks, as well as some of the characteristics of SIP trunks that are attractive to businesses, are described below.
SIP trunks enable enterprises to carry their voice data over a pure IP connection to carrier clouds, rather than through separate “voice-only” circuits. An enterprise SIP proxy peers with a carrier SIP proxy, with the appropriate federations and security protections established between them. The IP circuit continues to carry e-mail, Web, data, and other corporate traffic as it does today, and voice is simply added to the mix as another IP application. SIP sets up and tears down voice calls to and from the enterprise over this IP circuit.
Trunking with SIP becomes attractive to business because it removes the traditional boundaries of legacy services while improving efficiency and lowering total cost of ownership (TCO). These differences enable flexibility, change business disciplines and open doors to new business efficiencies and customer satisfaction.
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