T

TCP

Transmission Control Protocol

Transport protocol. Session-based transmission protocol: it sets up, monitors and terminates a connection between sender and recipient for transporting data.

TLS

Transport Layer Security

Protocol for encrypting data transmissions on the Internet. TLS is a superordinated Transport protocol.

Toggling

Toggling allows you to switch between two callers or between a conference call and an individual caller without allowing the waiting caller to listen in.

Transmission rate

Speed at which data is transmitted in the WAN or LAN. The transmission rate is measured in data units per unit of time (Mbit/s).

Transport protocol

Controls data transport between communication partners (applications).

See also: UDP, TCP, TLS.

U

UDP

User Datagram Protocol

Transport protocol. Unlike TCP, UDP is a non session-based protocol. It does not establish a fixed connection. The data packets (datagrams) are sent as broadcast. The recipient is solely responsible for making sure the data is received. The sender is not notified about whether it is received.

URI

Uniform Resource Identifier

Character string used to identify resources (e.g. e-mail recipient, http://siemens.com, files).

On the Internet URIs are used as a uniform identification for resources. URIs are also described as an SIP address.

Glossary

URIs can be entered in the phone as a number. By dialling a URI you can call an Internet subscriber with VoIP equip- ment.

URL

Universal Resource Locator

Globally unique address of a Domain on the Internet.

A URL is a subtype of URI. URLs identify a resource by its location in the Inter- net. For historical reasons the term is often used as a synonym for URI.

User IDSee User identification.User identification

Name/number combination for access e.g. to your VoIP account.

V

Voice codec

See Codec.

VoIP

Voice over Internet Protocol

Telephone calls are no longer placed and transmitted over the telephone network but over the Internet (or other IP networks).

VoIP provider

A VoIP, SIP or Gateway Provider is an Internet service provider that provides a Gateway for Internet telephony. As the phone works with the SIP standard, your provider must support the SIP standard.

The provider routes calls from VoIP to the telephone network (analogue, ISDN and mobile radio) and vice versa.

W

WAN

Wide Area Network

Wide-area network that is unrestricted in terms of area (e.g. Internet).

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