H.323 and SIP are both referred to

H.323 and SIP are both referred to as "call control" protocols. They allow a device, such as a desk phone, softphone, or videoconferencing system to place a call to another person over IP. H.323 was created by the ITU-T and was primarily focused on videoconferencing. SIP was developed by the IETF and was primarily focused on serving as a replacement for the desktop desk phone. While the initial focus of each protocol was slightly different, they are both used for voice phones and videoconferencing today. SIP is now extensively used in carrier networks today as a replacement of legacy PSTN ("Public Switched Telephone Network", i.e., "the old phone system") protocols.
MGCP refers to Media Gateway Control Protocol. It was adoped by Cable Labs as a standards in PacketCable and published as an informational RFC in the IETF. What MGCP does is allow a "Call Agent" to interface with "Media Gateways", allowing a PSTN gateway to effectively be decomposed into a control function (the Call Agent) and more or more media functions (the Media Gateways). The idea was to make it simple to scale out the number of PSTN gateway ports a call agent could support. Cisco's Communications Manager can act as the "Call Agent" and control the MGCP gateways directly. Another protocol like MGCP is called H.248 (or "Megaco"). This is a standard created jointly by the IETF and ITU and is a superset of the functionality found in MGCP, though the signaling protocol is quite different. Today, continued development of H.248 takes place exclusively in the ITU, I believe, and it is extensively used in carrier networks. (Both SIP and H.248 are core protocols in the 3GPP IP Multimedia Subsystem (IMS) used by legacy carriers to replace PSTN protocols.)
SCCP (sometimes referred to as "Skinny") is a Cisco proprietary protocol used for line-side control of phones connected to Communications Manager. SCCP was created because it was important to be able to control various buttons on the phone (e.g., hold, transfer, park, pick-up) and the standard call control protocols (H.323 and SIP) do not have a means of controlling buttons on phones. Cisco has been moving to replace SCCP with SIP in most instances for actual call establishment, while physical keys, soft keys, and UI elements are managed through other proprietary mechanisms.

Kết quả (Việt) 1:

H.323 và SIP cả hai được gọi là "gọi kiểm soát" giao thức. Họ cho phép một thiết bị, chẳng hạn như hệ thống điện thoại, softphone hoặc hội nghị truyền hình một bàn đặt một cuộc gọi cho người khác qua IP. H.323 được tạo ra bởi ITU-T và chủ yếu tập trung vào hội nghị truyền hình. SIP do IETF phát triển và chủ yếu tập trung vào phục vụ như là một thay thế cho điện thoại bàn máy tính để bàn. Trong khi trọng tâm ban đầu của mỗi giao thức là hơi khác nhau, họ đang cả hai được sử dụng cho điện thoại bằng giọng nói và hội nghị truyền hình vào ngày hôm nay. SIP được bây giờ rộng rãi sử dụng trong các nhà cung cấp mạng vào ngày hôm nay như là một thay thế của di sản PSTN ("khu vực Switched Điện thoại mạng", nghĩa là "điện thoại hệ thống cũ") giao thức.MGCP refers to Media Gateway Control Protocol. It was adoped by Cable Labs as a standards in PacketCable and published as an informational RFC in the IETF. What MGCP does is allow a "Call Agent" to interface with "Media Gateways", allowing a PSTN gateway to effectively be decomposed into a control function (the Call Agent) and more or more media functions (the Media Gateways). The idea was to make it simple to scale out the number of PSTN gateway ports a call agent could support. Cisco's Communications Manager can act as the "Call Agent" and control the MGCP gateways directly. Another protocol like MGCP is called H.248 (or "Megaco"). This is a standard created jointly by the IETF and ITU and is a superset of the functionality found in MGCP, though the signaling protocol is quite different. Today, continued development of H.248 takes place exclusively in the ITU, I believe, and it is extensively used in carrier networks. (Both SIP and H.248 are core protocols in the 3GPP IP Multimedia Subsystem (IMS) used by legacy carriers to replace PSTN protocols.)SCCP (sometimes referred to as "Skinny") is a Cisco proprietary protocol used for line-side control of phones connected to Communications Manager. SCCP was created because it was important to be able to control various buttons on the phone (e.g., hold, transfer, park, pick-up) and the standard call control protocols (H.323 and SIP) do not have a means of controlling buttons on phones. Cisco has been moving to replace SCCP with SIP in most instances for actual call establishment, while physical keys, soft keys, and UI elements are managed through other proprietary mechanisms.