Which method can be used to address variable-length dial plans?

A.
Overlap sending and receiving.

B.
Add a prefix for all calls that are longer than 10-digits long

C.
Use nested translation patterns to eliminate inter-digit timeout

D.
Use the @macro on the route pattern

E.
Use MGCP gateways, which support variable-length dial plans

Explanation:
Incorrect answer: BCDE
If the dial plan contains overlapping patterns, Cisco Unified Communications Manager does not
route the call until the interdigit timer expires (even if it is possible to dial a sequence of digits to
choose a current match). Check this check box to interrupt interdigit timing when Cisco Unified
Communications Manager must route a call immediately.
By default, the Urgent Priority check box displays as checked. Unless your dial plan contains
overlapping patterns or variable length patterns that contain!, Cisco recommends that you do not
uncheck the check box.
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_6_1/ccmfeat/fsintrcm.html