| 摘要 |
A service is provided not only by an internally preset fixed function but also by an externally provided function which can be altered by a user side. An exchange apparatus provided with a service process section for providing a service associated with a control signal comprises a process location determination section for determining a location of execution of a process associated with the control signal, a control signal notice section for issuing a notice on the control signal to the outside when the determination section has determined that the process is to be executed outside, a data storage section for storing data to be used when the process is executed, a data interface section for reference of data stored in the data storage section in accordance with a request arising from the externally executed service process, and service providing section for providing services based on a result of the externally executed process.
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