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...d when a mobile station has logged off, radio contact is not obtained with a mobile station or if a personal telecommunications user is temporarily not addressable at any user-network interface. 21 15 Call Rejected. Indicates that the equipment sending this cause does not wish to accept this call, alth9ough it could have accepted the call because the equipment sending this cause is neither busy nor incompatible. May also be generated by the network, indicating that the call was cleared due to a supplementary service constraint. 22 16 Number Changed. This is returned to a calling party when the called...