Session Initiation Protocol consists of two major components: the _____________ and __________________.
A.
User Agent Client, User Agent Server
B.
User Agent Client, User Agent Service
C.
User Client, User Service
D.
User Urgent Client, User Urgent Server
Explanation:
SIP consists of two major components: the User Agent Client (UAC) and
User Agent Server (UAS). The UAC is the application that creates the SIP requests
for initiating a communication session. UACs are generally messaging tools and
soft-phone applications that are used to place VoIP calls. The UAS is the SIP
server, which is responsible for handling all routing and signaling involved in VoIP
calls.