Abstract: A system and method for processing external handover of Digital Enhanced Cordless Telecommunication (DECT) line cards in a private switching system are disclosed. The DECT system in a private switching system has a plurality of DECT line cards, which are divided into a master line card and slave line cards, so as to perform the signaling protocol for the handover between the subscribers accommodated in the different DECT line cards without a CCFP. The method includes setting at least one DECT line card as a master line card, and setting the remaining cards as slave line cards, setting at least one Burst Mode Controller (BMC) as a master BMC and the remaining ones as slave BMCs, and generating a synchronous clock in the master BMC. The synchronous clock is applied to the slave BMCs, and signaling protocol information is analyzed in the master line card. The analyzed result of the information is provided to each of the slave line cards in accordance with the synchronous clock.