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Session Initiation Protocol trunks.
SIP allows IP Office users to take advantage of new telephony services being offered by Internet Telephony Service Providers. These telephony services can offer substantial savings in comparison to traditional trunks (analog and digital). With IP Office, users, regardless of their phone type, can make and receive calls on SIP trunks. SIP trunks are handled like any other trunk on the IP Office affording the call routing and control needed to manage inbound and outbound calls.
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