Which two security functions does secure RTP provide? (Select two)

A.
Signaling verification

B.
Encryption

C.
Authentication

D.
Signed images

E.
IS identification

F.
Certificate management

Explanation:
Media authentication and encryption features on Cisco’s portfolio of multiservice and integrated services routers helps ensure that voice conversations terminating on either TDM or analog voice gateway ports are protected from eavesdropping. These reliable, scalable features provide a secure environment for IP communications over a LAN (local area network) or WAN (wide area network).
Reference:
http://www.cisco.com/en/US/partner/products/ps5854/products_data_sheet0900aecd8016c784.html