Go back to CT0-101 - CompTIA Convergence+ Certification Exam

Question :-

According to the IETF, which of the following is the BEST functional description of a SIP phone in its ability to initiate and terminate calls?
Redirect Server and Registrar Server
Proxy Server and Location Server
User Agent Client (UAC) and User Agent Serve r (UAS)
SIP Presence and Location Server

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