Background:When applying SBC-B2B, as we know, the configuration dependence between SBC, interface SBC, traffic interface and vrf looks very like the figure below. /\
/ \
/SBC \
/.adj \
...
Troubleshooting Cisco IP telephonyBy Paul Giralt, Addis Hallmark, Anne Smithhas very helpfull information about trace reading especially for bigginners, it is also available in Google books:http://books.google.com/books?id=YcCjKsssklIC&pg=PA42&lpg=PA...
