The status of a call may have these values. Audio codec names to construct an audio codec. A caller is someone calling a callee via VoiceIP. A caller is someone calling a callee via VoiceIP. An array of Caller. An array of Caller. A callee is someone that can be called via VoiceIP. A callee is someone that can be called via VoiceIP. An array of Callee. An array of Callee. A unique call id to identify a call. A unique call id to identify a call. An audio codec to use for RTP transmission. Name of the audio coces (as defined in RFC 3551) Number of channels (as defined in RFC 3551) Sampling rate of the audio codec; a value of zero means "variable". An audio codec to use for RTP transmission. The call information needed by the participants to make a phone call. The RTP address of the other participant. The RTP send port of the other participant. The RTP port where the other participant wants to receive audio data. The exact time the server has received a request for initiating a call. The exact time the server has successfully established the call. The identification of the other participant. The call information needed by the participants to make a phone call. The client configuration of a client is needed by the service. The IP address of the client. The port number used for sending RTP data. The port number used for receiving RTP data. The IP address where the client is listening for service events. The port number where the client is listening for service events. A list of audio codecs the client can handle. The client configuration of a client is needed by the service. The environment a supplementary service needs to execute its functionality. The environment a supplementary service needs to execute its functionality.