This property specifies IP address that client will use. Depending on the state in which the session is, IP address will be specified by the client or by you. For example, after Announce() event has been fired, this property will be set to "0.0.0.0". You must specify an IP address that will be offered to the client. But, if events Request() or Released() were fired, this property will be set to an address that has been requested or released.