Patent ID: 8335216
Filing Date: 2012-12-18
Classification: H04L

Abstract:
1. A network facsimile apparatus, serving as a caller that establishes a session based on a Session Initiation Protocol to conduct image data communicating operations with other apparatuses serving as callees, comprising: a control section to suspend an operation for transmitting image data to a first callee when the first callee sends a communication incapable signal back to the caller in response to a session establishment request directed to the first callee and originally issued by the caller; a storage section to store a first IP address of the first callee; and a network interface control section that receives a session establishment request sent from a second callee and then, sends a session establishment response back to the second callee; wherein the control section compares the first IP address of the first callee, stored in the storage section, with a second IP address of the second callee, when image data is not transmitted to the caller from the second callee within a predetermined time interval after the session establishment response has been sent back to the second callee; and wherein, when the control section determines that the first IP address and the second IP address coincide with each other the control section deems the same apparatus to be serving as both the second callee and the first callee, and conducts controlling operations so as to transmit the image data, transmission of which is currently suspended, to the second callee.