A cordless telephone arranged for operation in a frequency hopping system includes an arrangement which achieves optimum utilization of multiple cordless telephone portable units by permitting these units to access a common base unit and also access each other. The portable units are configured...http://www.google.com/patents/US5758290?utm_source=gb-gplus-sharePatent US5758290 - Cordless telephone arranged for operating with multiple portable units in a frequency hopping system 
