In a Cisco Unified Contact Center Enterprise design, the customer wants to use Session Initiation
Protocol calls from its voice network carrier. Which design consideration is true for this solution?

A.
All agent phones must be configured as Session Initiation Protocol phones.

B.
Cisco Unified Border Element must be included for Session Initiation Protocol message
normalization and management.

C.
Cisco Unified IP IVR must be configured for G.711 voice calls only.

D.
Additional digital signal processor resources are required in the design for Session Initiation
Protocol calls.