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The appeal of Session Initiation Protocol (SIP) trunks as a means of connecting UC systems to the outside world is growing in popularity. SIP trunks offer lower operating costs, more flexibility in ordering service and capacities and advanced features, such as virtual phone numbers in different geographies, which let companies establish a virtual worldwide presence.
In contrast to legacy PRI trunks, SIP trunks use IP-based protocols that require a system to be opened up to a wide area network (WAN) that should be assumed insecure. Customers must educate themselves about the salient security aspects pertaining to SIP trunks and how to ensure the appropriate level of security.
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