What is the purpose of SIP in VoIP?
A) It carries voice and data.
B) It connects the VoIP phone to an analog phone.
C) It sets up the VoIP phone calls.
D) It works with a PBX.
C
Explanation: Session Initiation Protocol (SIP) is a VoIP signaling protocol used to set up, maintain, and tear down VoIP phone calls. SIP is spoken between the IP phone and the call agent to establish a call. The call agent then uses SIP to signal a local gateway to route the call, and that gateway uses SIP (across an IP WAN) to signal the remote gateway (on the right) about the incoming call.
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