| 摘要 |
The node apparatus of the present invention is a node apparatus (1, 2b) of an IP multimedia subsystem that provides a multimedia service to a user by using SIP to control multimedia communication that includes speech and is of a configuration that includes: a health check unit (11, 21b) that implements a health check upon an adjacent node apparatus; and a recognition unit (12, 22b) that recognizes a fault state of an adjacent node apparatus based on a result of a health check by the health check unit.
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