Communication switching system and method thereof

A communication switching system comprising:

• an IP-PBX (Internet Protocol Private Branch Exchange);
• a plurality of mobile phones, each of the mobile phones comprising a RFID (Radio-Frequency Identification) tag;
• a plurality of landline phones, each of the landline phones to communicate with another one of the landline phones through the IP-PBX, each of the landline phones comprising a RFID reader, each of the RFID readers comprising a first processor, the RFID readers to communicate with the RFID tag through RFID, when the distance between one of the mobile phones and one of the landline phones is in a preset range;
• and
• a RFID server comprising a database and a second processor, the database to record the mobile phone numbers of the mobile phones and the landline phone numbers of the landline phones, the RFID server being capable of communicating with the landline phones;
• wherein when one of the landline phones is used to call one of the mobile phones, the IP-PBX temporarily puts the call on hold, the first processor of the being used landline phone transmits the mobile phone number of the called mobile phone to the RFID server, the second processor of the RFID server searches the database to determine whether the mobile phone number corresponding to the called mobile phone is registered, and transmits the landline phone number corresponding to the mobile phone number to the RFID reader when the phoned mobile phone number corresponding to the called mobile phone is registered, the first processor of the RFID reader receives the landline phone number corresponding to the mobile phone number and determines whether the landline phone corresponding to the received landline phone number is busy through the IP-PBX, the IP-PBX switches the call to the landline phone corresponding to the received landline phone number when the landline phone corresponding to the received landline phone number is idle, and
• wherein each of the landline phones further comprises a storage unit storing its landline phone number, each of the RFID tags stores an EPC (Electronic Product Code) recording one of the mobile phone numbers of each of the mobile phones, when the distance between the mobile phone and the landline phone is within a preset value, the RFID tag of the mobile phone transmits the EPC to the RFID reader, the first processor transmits the EPC and its landline phone number to the RFID server, the second processor of the RFID server searches the database to determine whether the mobile phone number recorded in the EPC and the landline phone number are registered, and registers the mobile phone number and the landline phone number in the database when the mobile phone number and the landline phone number are not registered.