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A sends a SIP INVITE request to B. This message is an invitation for B to
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participate in a SIP telephone call.
B sends a response indicating that the telephone is ringing.
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B sends an OK response after the call is answered.
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A then sends an ACK message to acknowledge that B has answered the call.
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Now A and B exchange voice media (talk).
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After talking, A hangs up and sends a BYE request.
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B replies with an OK response confirming receipt of the BYE request and the call is
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terminated.
10.9.2 SIP Client Server
SIP is a client-server protocol. A SIP client is an application program or device that
sends SIP requests. A SIP server responds to the SIP requests.
When you use SIP to make a VoIP call, it originates at a client and terminates at a
server. A SIP client could be a computer or a SIP phone. One device can act as
both a SIP client and a SIP server.
MAX208M2W Series User's Guide
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