| http://www.w3.org/ns/prov#value | - In this case, if a calling legacy terminal enters an off-hook state, the outgoing call controller CLG refers to a database DB 28 which stores information such as a port number and a phone number, etc. of a calling legacy terminal in the same manner as a common exchange system containing legacy terminals, so that the outgoing call controller CLG recognizes the information with reference to the data
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