In RFC 3262, a mechanism was developed to ensure that the responses are sent reliably and acknowledged alone so that the status of the call is not lost if the transport protocol is something like UDP.
在RFC 3262中，开发了一项机制来确保可靠地发送消息，且仅为确认目的而发送，以便在使用udp之类的传输协议时不会丢失呼叫状态。
The key is the use of the UDP, which is the parter transport protocol to TCP.
关键是 UDP 的使用，它是 TCP 的缔约方传输协议。
The two most popular transport layer protocols are the transmission control protocol (TCP) and the user datagram protocol (UDP)
两种最流行的传输层协议是传输控制协议（TCP）和用户数据报协议（UDP）
应用推荐