Chapter 8 Features of Other Compatible Cisco Devices
DT-24+ and DE-30+ Digital Gateway Modules
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Digital gateways differ from analog gateway products in that they support digital ISDN features including Direct Inward Dialing (DID) and caller ID. These features allow outside callers to dial directly to a particular user without going through an attendant (operator). In addition, digital interfaces usually provide a more economical interface choice when the number of trunks exceeds six to eight channels.
When more than one digital gateway is needed, the additional gateway can be treated as a separate gateway or aggregated with the other gateways as a common pool of channels. Any number of digital gateways can be installed in a network, and the number installed in a PC is limited only by the number of available slots.
Digital gateways communicate with Cisco CallManager, which allows the implementation of supplementary services such as holding, transferring, and forwarding of outside calls. Also, with proxy signaling provided by the Cisco CallManager, the digital gateways are fully compatible with H.323 V.2.
DT-24+ Digital Gateways
DT-30+ Digital Gateways
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