Patent ID: 8180031
Filing Date: 2012-05-15
Classification: H04L

Abstract:
1. A data communication apparatus configured to perform data communication by using a call control protocol, the apparatus including: a message receiving unit configured to receive a call connection request message from an external apparatus; a message transmitting unit configured to transmit a response message in reply to the call connection request message; a determining unit configured to determine whether a call connection process for communication with another external apparatus differing from the external apparatus is under execution, when the message receiving unit receives the call connection request message; and a control unit configured to control transmission of the response message from the message transmitting unit based on a determination result of the determining unit, wherein when the determining unit determines that the call connection process for communication with the another external apparatus is not under execution, the control unit controls the message transmitting unit to transmit the response message, and wherein when the determining unit determines that the call connection process for communication with the another external apparatus is under execution, the control unit executes control not to transmit the response message until the call connection process for communication with the another external apparatus is ended, and controls the message transmitting unit to transmit the response message after the call connection process for communication with the another external apparatus is ended, and, a call connection process for communication with the external apparatus is executed in parallel with an image data communication with the another external apparatus.