PROTOCOL CONVERSION IN A PUSH-TO-TALK OVER CELLULAR (POC) COMMUNICATION SYSTEM

摘要

According to a method for operating a push-to-talk session between at least a first terminal (UE1) and a second terminal (UE2) by use of a push-to-talk server (PTTSv) of a cellular radio communications system, data of the push-to-talk session is transferred via the push-to-talk server (PTTSv) from the first terminal (UE1) to the second terminal (UE2) and vice versa. According to the invention the push-to-talk server (PTTSv) processes data of the push-to-talk session in at least a first data format (FSIP, FRTP, FRTCP), the cellular radio communications system receives data (D2) of the push- to-talk session from the second terminal (UE2) in at least a second data format (FSMS), the data in the second data format (FSMS) being a short message service message (D2) or a multi- media messaging service message, and an interworking unit (IWU) converts data from the second data format (FSMS) into the first data format (FSIP, FRTP, FRTCP) and vice versa.