u201c prepare for incoming call request u201d type and the u201c prepare for incoming call reply u201d type may include a mandatory indicator set to off so that implementations that do not support this type may ignore these control messages but in another embodiment the u201c prepare for incoming call request u201d type and the u201c prepare for incoming call reply type u201d may be required to be supported fig3 depicts a flowchart of example processing for handling a prepare for incoming call request control message according to an embodiment of the invention control begins at block 300 control then continues to block 305 where the target server 134 creates a tunnel to the computer system 100 control then continues to block 310 where the target server 134 sends the control message 148 to the computer system 100 which is intended to make the target server 134 available to the clients 132 control then continues to block 315 where the controller 150 determines whether the control message 148 contains the type 250 that indicates that this control message is intended to prepare the computer system 100 for an incoming call from one of the clients 132 if the determination at block 315 is true then the type 250 in the control message 148 indicates that the computer system 100 should prepare for an incoming call so control continues from block 315 to block 320 where the controller 150 prepares the network interface 114 such as a modem or lan card for the clients 132 to connect to control then continues to block 325 where the controller 150 determines whether the preparation at block 320 was successful if the determination at block 325 is.