| 摘要 |
A method for testing continuity of an ISUP relay call in an ISUP network consisting of a proceeding switching system and a following switching system, in which, in setting up a call, a preceding switching system transmits a call set-up message, that is, an initial address message (IAM), for continuity testing to a following switching system and at the same time forms a communication path loop, and upon receipt of, the IAM, the following switching system transmits a testing sound to the communication loop to test continuity of the communication path.
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