1.First Call
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A Calls B Forwarded to C.
C – exchnge Gets
Calling -A
Called – B
Redirecting – B
OCN – B
2.C-Forwarded to D
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A Calls B Forwarded to C Fwded to D
D – exchnge Gets
Calling -A
Called – D
Redirecting – C
OCN – B
Hope you understand this….
There will be a Redirecting counter which can be controlled by exchanges.