Which of the following deployment scenarios will be most suitable for a customer that requires full telephony feature transparency, requires high availability and has two sites with 3000 IP phones connected via a low-delay connection? Select exactly 1 answer(s) from the following:
A.
Intermedia engine solution
B.
clustering over the IP WAN
C.
multisite WAN with centralized call processing
D.
multisite WAN with distributed call processing