Which are key devices in the SAFE VoIP large network campus server module? (Choose three)

A.
Layer 2 switch

B.
Call-processing manager

C.
NIDS appliance

D.
Proxy server

E.
IP phones

F.
Stateful firewall

Explanation:

The following are the key IP telephony devices in the large network campus server module:
1) Layer 3 switch
2) Corporate servers
3) Call-processing manager
4) Stateful firewall
5) Proxy Server
Reference: Cisco Courseware page 9-70