When a Session Initiation Protocol user agent client initiates a call to another user agent server, what is thefirst message type that is sent to the Cisco SIP Proxy Server?

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

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