Glossary
34 XN120 Voice Over IP Card Guide
Glossary
CODEC COder/DECoder. An integrated circuit that converts digital signals to and from analog
(Pulse Code Modulation) form.
DDI Direct Dial In
The Network will send the last digits of the number to the telephone system. The
telephone system can then route the call based on its own routing tables.
DSP Digital Signal Processor.
Converts analogue signals to a digital form (sampled).
IP Internet Protocol
ISDN Integrated Services Digital Network
IETF Internet Engineering Task Force.
The IETF is an international community of network designers, operators, vendors and
researchers whose purpose is to coordinate the operation, management and evolution of
the Internet and to resolve short- and mid-range protocol and architectural issues.
PSTN. Public Switched Telephone Network.
The collection of interconnected systems operated by the various telephone companies
and administrations (telcos and PTTs) around the world.
SIP Session Initiation Protocol. An IETF standard that defines the delivery of Voice over IP
and Multimedia services.
VoIP Voice over Internet Protocol
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