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Communication system, terminal device, and communication method for performing communication based on the real-time transport protocol/RTP control protocol
Communication system, terminal device, and communication method for performing communication based on the real-time transport protocol/RTP control protocol
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机译：基于实时传输协议/ rtp控制协议进行通信的通信系统，终端设备和通信方法
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摘要
A communication system for performing communication based on the Real-time Transport Protocol/RTP Control Protocol (RTP/RTCP) comprises a communication control device, a first NAT device and a second NAT device, a caller terminal device, and a callee terminal device. The caller terminal device transmits a first packet to the communication control device, receives a second packet that contains a second port number that is stored in the second NAT device, determines whether the second port number is one of an odd number and an even number; and transmits, in a case where it has been determined that the second port number is an odd number, an RTP packet to a port number that is computed by adding 2n−1 to the second port number, then transmits an RTCP packet to a port number that is computed by adding 2n to the second port number.
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