Mike works as a Sales Engineer for Umbrella Inc. The employees of the company are reporting problems with voice delays on telephone calls on the corporate VoIP network. What is the most likely cause of this problem?

A.
Large data packets are causing the voice packets to exceed their delay budget.

B.
Voice codec is not able to compress the voice stream into pack.

C.
Echo cancellation has been enabled on the voice coders without configuring phase shifting.

D.
The destination number is not contained in the local dial plan.