2 Port Direct Inward Dial (DID) / FXS Dual Function Voice/Fax Interface Card

Direct Inward Dialing (DID) is a service offered by telephone companies that enables callers to dial directly an extension on a PBX or packet voice system (for example, Cisco CallManager and Cisco IOS® routers and gateways) without the assistance of an operator or automated call attendant. This service makes use of DID trunks, which forward only the last three to five digits of a phone number to the PBX, router, or gateway. For example, a company has phone extensions 555-1000 to 555-1999. A caller dials 555-1234 and the local central office (CO) forwards 234 to the PBX or packet voice system. The PBX or packet voice system then rings extension 234. This entire process is transparent to the caller.
Analog DID Voice Interface Cards (VICs) service analog public switched telephone network (PSTN) DID trunks with the use of analog voice or fax. They have dual working modes, DID and FXS. These two modes are mutually exclusive.

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