an input port 222 the telco interface circuit 212 the tdd circuit 206 the rf transceiver 204 and the external timing interface 214 are coupled to a bus 220 for control by and communication with the microprocessor 224 the bus 220 is also coupled to an internal timing generator 226 for control and generation of tdd timing in the absence of the external timing signal in addition a random access memory ram 228 is coupled to the microprocessor 224 for storing temporary operating values the elements 202 204 206 208 210 212 214 218 220 222 224 226 and 228 of the electrical block diagram of the telepoint base station 102 described above preferably comprise components of the s35xgb1602ap telepoint base station with optional sync board ntn6085c both available from motorola inc of schaumburg ill it will be appreciated that other similar components may be substituted as well a read only memory rom 230 is coupled to the microprocessor 224 for storing pre programmed executable firmware elements used to control operation of the telepoint base station 102 in accordance with the preferred embodiment of the present invention the firmware elements comprise an rf link reestablish element 232 for generating a command to the portable communication units 120 to drop and then reestablish active rf links 106 a telco audio disable element 234 provides for disabling audio sent to the telephone system during rf link reestablishment a telco audio reenable element 236 provides for reenabling the audio sent.