The use of secure cryptographic protocols such as ________________ ensures that all SIP packets are conveyed within an encrypted and secure tunnel.

The use of secure cryptographic protocols such as ________________ ensures that all SIP packets are conveyed within an encrypted and secure tunnel.

A.
Real-time Transport Protocol

B.
Session Initiation Protocol

C.
Transport Layer Security

D.
PPTP

Explanation:
The use of secure cryptographic protocols such as Transport Layer
Security (TLS) ensures that all SIP packets are conveyed within an encrypted and
secure tunnel. The use of TLS can provide a secure channel for VoIP client/server
communication and prevents the possibility of eavesdropping and packet manipulation.