| http://www.w3.org/ns/prov#value | - Regarding the SIP server according to the second embodiment, the point that the SIP server 100 is a redundantly configured server (ACT/SBY server) is the only difference from the first embodiment, and the SIP server according to the second embodiment has the same advantages as those achieved in the first embodiment except for advantages achieved by using the third memory 20 b, the fourth memory 30
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