Patent ID: 7038800

Claim:
A communication apparatus comprising: an audio compression unit for compressing an audio signal and outputting said compressed audio signal; a fax-termination/switching control unit which carries out termination processing on a fax signal and controls a switch to output not an output at said audio compression but said fax signal completing said termination processing when said fax signal is detected; and an exclusion processing unit which is provided in front of said audio compression unit and blocks transmission of a raw negotiation signal to said audio compression unit in an exclusion process when detecting said negotiation signal, thereby the blocked negotiation signal being unrecognizable as said negotiation signal to a receiver fax terminal, wherein said negotiation signal is transmitted by an accommodating fax terminal prior to a fax data communication, a fax communication is performed based on a first fax communication protocol when said negotiation signal is recognized by a receiver fax terminal, and a fax communication is performed based on a second fax communication protocol when said negotiation signal is not recognized by a receiver fax terminal.