AbstractLocalCall CreateIncomingCall(
	AbstractPhoneLine line,
	SIPCall caller
)

Function CreateIncomingCall ( 
	line As AbstractPhoneLine,
	caller As SIPCall
) As AbstractLocalCall

AbstractLocalCall^ CreateIncomingCall(
	AbstractPhoneLine^ line, 
	SIPCall^ caller
)

abstract CreateIncomingCall : 
        line : AbstractPhoneLine * 
        caller : SIPCall -> AbstractLocalCall