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Several call types such as Direct Inward Dialing (DID), Direct Outward Dialing (DOD), INWATS, OUTWATS or two-way calls can be handled on any available channel which reduces the number of trunks required.
SuperTrunk lets PBX users make more calls with fewer trunks by combing Direct Inward Dialing (DID) and Direct Outward Dialing (DOD) in the same trunk, along with DID Number Blocks, increasing trunk utilization.
These gateways communicate with legacy Class 5 telephony switches and allow carriers to provide, and end users to enjoy, the same voice services they have today -- including Plain Old Telephone Service (POTS), Centrex, direct inward dialing, direct outward dialing, voice mail, E-911 and 411, call waiting, speed dialing, and other popular CLASS features.

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