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Chapter 10 The VoIP Account Screens
WiMAX Device Configuration User’s Guide
170
14 The UPDATE request is forwarded by P to B.
15 B receives the UPDATE request and responds with an OK message.
16 The OK message is received by A.
17 After talking, A hangs up and sends a BYE request.
18 B replies with an OK response confirming receipt of the BYE request and the call is terminated.
10.8.2 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.
For more information on the SIP protocol, please refer to RFC 3261.