Method for testing continuity of ISUP relay call
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United States of America Patent
Stats
-
Jul 8, 2003
Grant Date -
May 31, 2001
app pub date -
Nov 29, 2000
filing date -
Nov 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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