Patent ID: 8922815

Claim:
A communication apparatus comprising: a first storage unit that stores an Internet protocol (IP) address; a call connection unit that connects a call by transmitting a call connection request, via a communication control apparatus connected to a public IP network and selecting the public IP network to transmit incoming data to the public IP network, to a communication apparatus having an IP address and connected to the public IP network, and by receiving, via the communication control apparatus, session description protocol (SDP) information as response information, including IP address information, transmitted in response to the call connection request; an IP address retrieval unit that retrieves the IP address included in the response information received by the call connection unit; an instructing unit that, if the IP address retrieved by the IP address retrieval unit is different from the IP address stored on the first storage unit, overwrites the IP address stored on the first storage unit with the retrieved IP address, and instructs the communication control apparatus to overwrite an IP address stored on the communication control apparatus with the retrieved IP address; and a transmitting unit that transmits facsimile data, via the communication control apparatus, to the IP address provided as a result of overwriting by the instructing unit as a destination address if the facsimile data are to be transmitted to the communication apparatus connected to the public IP network.