Jake’s Brakes is using an H.225 gatekeeper-controlled trunk between a Cisco Unified Communications Manager cluster and a gateway. When designing the security component for the Cisco Unified Communications Manager clusters, what two things can happen if you use a firewall between a Cisco Unified Communications Manager cluster and the voice and data VU\Ns? (Choose two.)

A.
clipping of the voice stream

B.
call setup failure

C.
one-way audio

D.
choppy audio

E.
echo