Method for compressing real-time transport protocol hader extension field and header compressed by the method

PURPOSE: A method for compressing real-time transport protocol header extension field and header compressed by the method are provided to efficiently compress the information by removing the information recorded repeatedly to the RTP header extension field. CONSTITUTION: The information is collected in the RTP(Real-time Transport Protocol) header. The information confirms the RTP header extension field(310) within the RTP header. The information directs the confirmation result. The profile information(311) of the extension field is collected. The total length information(312) of the extension field is collected. The information is collected through the HIM(Header extension Information Map)(322). The information directs the presence of the modified data.