Patent ID: 7982895

Claim:
An image communication apparatus capable of communicating with external apparatuses, comprising: a receiving unit configured to receive image data, which is originally addressed to a second external apparatus, from a first external apparatus, under a condition in which an address of the image communication apparatus is registered in an SIP server as an alternative address of the second external apparatus; a storage unit configured to store the image data received by the receiving unit; an inquiring unit configured to send an inquiry requesting an address of the second external apparatus to the SIP server; a determination unit configured to determine, based on a response to the inquiry by the inquiring unit, whether the second external apparatus is in a state in which the second external apparatus is able to receive image data; and a transmission unit configured to transmit the image data stored in the storage unit to the second external apparatus in a case where the determination unit determines that the second external apparatus is in the state in which the second external apparatus is able to receive image data.