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Session Initiation Protocol (SIP) has emerged as the universal blueprint for IP Telephony and unified communications in general. By supporting a wide range of media sessions, SIP allows users to engage in anytime-anywhere integrated business communications regardless of location, media type or device. For enterprises, the benefits of SIP can be significant - accelerated business communications, improved information transfer and file sharing, enhanced worker productivity through conferencing and collaboration capabilities, and reduced mobile phone costs through the use of soft clients remotely. This paper provides an introduction to SIP trunking and why it provides a compelling alternative to more traditional, yet less flexible ISDN-PRI digital trunking solutions.
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