SIP is part of an Internet Engineering Task Force (IETF) proposal to replace parts of H.323.Just as H.323 is a collection of protocols, SIP is one of several protocols that will work together to complete calls.是什么意思_SIP is part of an Internet Engineering Task Force (IETF) proposal to replace parts of H.323.Just as H.323 is a collection of protocols, SIP is one of several protocols that will work together to complete calls.在线翻译_英语_读音_用法_例句