| 摘要 |
A Network Call Trace (NCT) method and system enables a call path route to be traced in a telecommunications network. A Type of Digit (TOD) in the Generic Digits Parameter (GDP) for an Integrated Services Digital Network (ISDN) Use r Part (ISUP) command can be utilized to realize the NCT. A listing of Switch IDs (SIDs) from the originating subscriber's switch to the terminating subscriber's switch is provided so that routing inefficiencies can be discovered. In one embodiment, an Initial Address Message (IAM) is transmitt ed with a TOD Network Call Trace in the GDP. The NCT includes the SID of the originating switch. Any intermediate switches between the originating switch and the terminating switch likewise append their own SID onto the NCT list o f SIDs. Finally, the terminating switch also adds its SID onto the end of the NCT list. This NCT list may then be transmitted and displayed for analysis. For example, it may be transmitted in a backward message such as address complete message (ACM), answer message (ANM), call progress (CPG), or releas e (REL) back to the originating switch via the network. Alternatively, the NCT list may be sent to a Network Management Center.
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