RADVISION术语表

Glossary (I)

# - A - B - C - D - E - F - G - H - I - J - K - L - M - N
O- P - Q - R - S - T - U - V - W - X - Y - Z

IAD (INTEGRATED ACCESS DEVICE)
A device that consolidates voice, data, Internet, and video services using DSL, ATM, TDM, or MGCP over T-1/E-1 lines. There are also IADs that connect to the service provider over wireless links like WiMAX. The IAD is a modern form of a CPE, i.e. a device that is installed in end-users’ homes.

ICE (INTERACTIVE CONNECTIVITY ESTABLISHMENT)
A methodology for Network Address Translator (NAT) traversal for the Session Initiation Protocol (SIP). ICE makes use of existing protocols, such as Simple Traversal of UDP Through NAT (STUN), Traversal Using Relay NAT (TURN) and even Real Specific IP (RSIP). ICE works through the mutual cooperation of both endpoints in a SIP dialogue.

IETF (INTERNET ENGINEERING TASK FORCE)
Formed in 1986, the IETF sets the technical standards that run the Internet. IETF working groups seek the advice of the Internet community through RFCs (Requests for Comment), and then submit recommendations to the IETF for final approval.

IMEI (INTERNATIONAL MOBILE STATION EQUIPMENT IDENTITY)
A unique number allocated to each individual mobile station equipment in the PLMN and unconditionally implemented by the mobile station manufacturer.

INTERWORKING WLAN (I-WLAN)
A WLAN that interworks with a 3GPP system.

IMS (IP MULTIMEDIA SUBSYSTEM)
A standardized Next Generation Networking (NGN) architecture for telecom operators that want to provide mobile and fixed multimedia services. It uses a VoIP implementation based on a 3GPP standardized implementation of SIP, and runs over the standard Internet Protocol (IP). It supports both packet-switched and circuit-switched existing phone systems. The aim of IMS is not only to provide new services but all the services, current and future, that the Internet provides. IMS uses open standard IP protocols, defined by the IETF. IMS truly merges the Internet with the cellular world; it uses cellular technologies to provide ubiquitous access and Internet technologies to provide appealing services. Because it is access network independent, IMS enables converged fixed mobile network.

IMTC
An international community of companies working together to promote and facilitate the development and use of interoperable, real-time, multimedia telecommunications products and services based on open international standards.

INCOMING CALL ROUTING
See DID, MSN, Sub-Addressing, TCS4

INSTANT MESSAGING (IM)
Instantly communicating between two or more people over a network such as the Internet. Instant messaging requires the use of a client program that hooks up an instant messaging service and differs from e-mail in that conversations are then able to happen in real-time. Most services offer a presence feature, indicating whether people on one's list of contacts are currently online and available to chat.

INTERACTIVE VIDEO PLATFORM
A scalable carrier-grade platform for service providers that enables easy creation of interactive multimedia (video and voice) services, based on advanced media processing capabilities. The platform complies with all voice/video IP standards and protocols and can be part of H.323, SIP or IMS networks. Many services can be implemented on top of this platform; examples include video portals, video chat rooms, video dating services, video contact center applications, surveillance applications, mobile video conferencing and more.

INTERNET PHONE
A special Voice over IP (VoIP) terminal that is designed to be used over the Internet. Typically, it uses the Session Initiation Protocol (SIP) or Media Gateway Control Protocol (MGCP).

IP-CAN (IP-CONNECTIVITY ACCESS NETWORK)
The collection of network entities and interfaces that provides the underlying IP transport connectivity between the UE and the IMS entities. An example of an IP-Connectivity Access Network is GPRS.

IP ADDRESS
The unique address of a computer attached to a TCP/IP network. IP addresses are 32 bits long. Each octet is represented in decimal and is separated by dots.

IP MULTICAST
A means of simultaneous transmission of data from a server to a group of selected users on a TCP/IP network, (internal, intranet or Internet). IP multicast is used for streaming audio and video over the network.

IP NETWORK
A network that uses the TCP/IP protocol.

IP TELEPHONY
A set of technologies that enables voice, data and video collaboration over existing IP-based LANs, WANs, and the Internet. IP telephony uses open IETF and ITU standards to move multimedia traffic over any network that uses IP.

IPTV (INTERNET PROTOCOL TELEVISION)
A system where a digital television service is delivered to subscribing consumers using the Internet Protocol over a broadband/mobile connection. The DVB family of protocols utilize IPTV as their media transport mechanism.

ISDN (INTEGRATED SERVICES DIGITAL NETWORK)
An entirely digital telephone network that allows both data and voice communications over the same line. ISDN replaces the old analog local loop and operates at significantly faster speeds than the traditional telephone service.

ISDN ROLLOVER
ISDN Rollover feature ensures that a call is completed even when call volume is high. ISDN Rollover requires support by the PSTN switch application and presumes the availability of a pool of stacked Gateways across the managed network.

ISMA (THE INTERNET STREAMING MEDIA ALLIANCE)
A non-profit organization whose mission is to accelerate the market adoption of open standards for streaming and progressive download of rich media over all types of Internet Protocols (IP).

ISUP (ISDN USER PART)
Part of the Signaling System #7 (SS7) which is used to set up telephone calls in Public Switched Telephone Networks (PSTN). It defines the protocol and procedures used to set up, manage, and release trunk circuits that carry voice and data calls over the PSTN.

ITU (INTERNATIONAL TELECOMMUNICATIONS UNION)
The most important telecom standards setting organization in the world. With headquarters in Geneva, the ITU is an international organization founded in 1865, now part of the United Nations System that sets communications standards for global telecom networks.

ITU-T
The Telecommunication Standardization Sector of the ITU, developing standards for interconnecting telecommunication equipment across networks.

IVR (INTERACTIVE VOICE RESPONSE)
A two-stage incoming call routing method supported by the Gateway. It enables DID to a LAN terminal, even when the ISDN lines do not have multiple numbers allowing direct dialing to an endpoint.

IVVR (INTERACTIVE VOICE AND VIDEO RESPONSE)
Enhances the familiar (but audio-only) interactive voice response (IVR) self-service environment with video content to accompany the audio messages.