SIP Trunking Scenario
You consider your company well-connected – you’ve got voice, video, and data all routed over the IP backbone of a carrier using VoIP IP Centrex technology; a Softswitch handles calls to other VoIP phones. Or alternatively, your PBX routes calls and provides supplementary services and you have expensive PRI lines or multiple FXO lines in your solution. The problem with limiting yourself to a hosted IP Centrex solution alone or a large scale IP-PBX with TDM lines solution is that such approaches are expensive.
The Fusion Series of Multi-Service Business Gateways supports a less expensive solution because it supports SIP trunking to lower costs of PBX solutions and replaces the need for expensive ISDN PRIs or multiple FXO lines. In cases of IP-Centrex, you can deploy much more affordable SIP trunks to hosted providers and preserve DIDs and centralized hosted services, and long distance access over VoIP, and deploy low-cost small IP-PBXs at the premises to switch local calls. These can lower your Total Cost of Ownership (TCO).
In the figure, you can see that the IP PBX, coupled with SIP Trunks, provides similar features to full IP Centrex solutions -- but SIP Trunks are less costly because a single SIP Trunk can serve the outgoing call needs of three to four employees (depending on concentration rate), while a hosted IP Centrex solution without SIP trunking requires a hosted seat for each employee.
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