Which three features does the SIP Proxy software provide when Cisco Unified Contact Center Enterprise, Cisco Unified Customer Voice Portal, and Cisco Unified SIP Proxy are used? (Choose three.)
A. centralized dial plan
B. load balancer for HTTP and SIP
C. integration with Cisco ISR using SM-SRE
D. N+1 or N.N redundancy
E. box-to-box redundancy
F. demarcation point between networks
