Strictly speaking, CANCEL is a different request, and accordingly, a different transaction.
However, you should be able to access INVITE transaction data from the failure_route triggered in connection with transaction cancellation.
-- Alex Balashov | Principal | Evariste Systems LLC 1447 Peachtree Street NE, Suite 700 Atlanta, GA 30309 United States
Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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