VoIP Glossary 
D

Dial-Up Internet : a type of Internet connection established using PSTN line. Maximum speed of 56 Kbps can be achieved with on a dial-up Internet access.

Dial-Up IP-Phone : a type of VoIP hard phone that comes with built-in modem and RJ-11 port for dialing to ISP and for Internet access.

DS : Digital Service

DSL : Digital Subscriber Line. A type of high speed Internet access. DSL is one of the popular digital service, 256 Kbps speed is 4 times faster than a dial-up Internet.

DSL modem : a device used as a bridge to connect to high speed/broadband Internet access.

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