Patent ID: 8732333

Claim:
A receiving apparatus that performs call control in association with a transmitting apparatus, according to Session Initiation Protocol (SIP), the receiving apparatus comprising: a receiving unit configured to receive from the transmitting apparatus an INVITE command containing first destination information related to performing encrypted communication or second destination information related to performing non-encrypted communication; a determining unit configured to determine destination information contained in the received INVITE command; and a notification unit configured to notify the transmitting apparatus of a first port number for the encrypted communication when the destination information contained in the received INVITE command is the first destination information, and notify the transmitting apparatus of a second port number for the non-encrypted communication when the destination information contained in the received INVITE command is the second destination information, wherein the first destination information or the second destination information, whichever is contained in the received INVITE command, is described in a TO header of the received INVITE command, wherein the first destination information and the second destination information are different addresses for the receiving apparatus, and wherein the first port number and the second port number belong to the receiving apparatus.