One of a large family of specifications that define the transmission of information over data networks. It tracks the Internet addresses of nodes, routes outgoing messages, and recognizes incoming messages.
A general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN).
Provide connections into the Internet for home users and businesses. There are local, regional, national, and global ISPs. An ISP is usually a local service provider that is in the business of providing customers with Internet access and customer support.
A basic device that terminates PSTN-switched circuits (trunks and local loops) and converts from pulse code modulated information to packetized information, and vice versa. It also handles RTP media streams across the IP network.
Handles registration, management, and control functionality of resources in the Media Gateway. It performs protocol conversion between PSTN signaling protocols and IP telephony. It gathers information about IP and circuit flows and provides that information to billing and management systems.
A device using which video and voice (multimedia) can be transmitted over cable data networks.
Networks that break up a message into smaller packets before switching the packets to their required destination. Each packet contains a destination address so all packets in a single message do not have to travel by the same path. The destination computer reassembles the packets back into their proper sequence.
A telephone switch located on the premises of a company. It allows telephone users to set up circuit- switched voice calls among other users in the same company or to set up calls across the public-switched telephone network.
The worldwide voice telephone network that traditionally routes voice calls from one location to another.
A protocol that is optimized in various ways for the delivery of real-time data such as live and/or interactive audio and video over IP packet-switched networks. RTP runs over UDP and uses its multiplexing and error-checking features.
A protocol that describes a format for conveying descriptive information about multimedia sessions. This information includes session name and purpose, session time, type of media (voice or video), media format (MPEG, for example), transport protocol and port number, bandwidth requirements, and contact information.
An ASCII-based protocol that provides telephony services similar to H.323, but is less complex and uses less resource. It creates, modifies, and terminates sessions with one or more participants. SIP is a request-response protocol, dealing with requests from clients and responses from servers.
An out-of-band signaling system used by the carriers to set up telephone calls. It is a protocol standard defined by the ITU. Network elements in the public- switched telephone network use SS7 to exchange information used not only to set up calls but to control the network. Part of SS7's call setup process is to create a circuit for the call through the telephone network and then to place the call on the circuit.
A transport-layer protocol that has no error checking, flow control, or reliability mechanism. It is a best- effort, connectionless transport of voice, video, and data. This is used as a faster means of transport for voice calls.
The capability to carry normal telephony-style voice over an IP-based Internet or data links with POTS-like functionality, reliability, and voice quality. VoIP enables a router to carry voice traffic (for example, telephone calls and faxes) over an IP network.
文章整理：西部数码--专业提供域名注册、虚拟主机服务
http://www.west263.com
以上信息与文章正文是不可分割的一部分,如果您要转载本文章,请保留以上信息，谢谢!
