English to German Tech/Engineering Media / Multimedia

For example, control information of the monitoring media copying is carried in an SIP message body, wherein the control information includes the destination IP address and port information of the media copying. A character string composed of 16 letters is used at an SIP extension head X-Indication, and the monitoring instruction is placed therein. For example, "a port in the SIP message body" modulo 16 may get a value in the range of 0-15, which then serves as a position for depositing the monitoring instruction, a letter B is used as an instruction that an ordinary call is not monitored, and other 15 letters may be random letter combination of {0-9}, {a-z} and {A-Z}.