When a Session Initiation Protocol user agent client initiates a call to another user agent server,
what is the first message type that is sent to the Cisco SIP Proxy Server?
A.
invite
B.
trying
C.
initiate
D.
setup
what is the first message type that is sent to the Cisco SIP Proxy Server?
When a Session Initiation Protocol user agent client initiates a call to another user agent server,
what is the first message type that is sent to the Cisco SIP Proxy Server?