| 摘要 |
When data communication is performed by using a call control protocol, a data communication apparatus receives a call connection request message from an external apparatus and transmits a response message in reply to the call connection request message. At that time, when the call connection request message is received, it is determined whether a call connection process for communication with another external apparatus differing from the external apparatus is under execution. Transmission of the response message is controlled based on a result of the determination.
|
