Patent ID: 7826347

Claim:
A call processing device communicating with a plurality of line cards, the call processing device comprising: a storage module configured for storing a mapping table and an address table, wherein the mapping table comprises a plurality of telephone numbers and a plurality of indices of the line cards respectively related to the plurality of telephone numbers, the address table comprises the plurality of indices and corresponding addresses of the line cards, and wherein the line cards operate in various modes comprising active mode, backup mode and standalone mode, with the address of the line cards operating in backup mode specially preset; an index search module configured for receiving a telephone number and searching the mapping table for one of the indices of the line cards related to the received telephone number; an address search module configured for searching the address table for one address of the line card corresponding to the index sought by the index search module; a call module configured for rejecting a call corresponding to the received telephone number if the acquired address is the specially preset address; and an update module configured for updating one or more of the addresses of the line cards in the address table if operating modes of one or more of the line cards are changed.