Which method does a Cisco Unified 9971 phone use to send keep-alive messages to Cisco Unified Communications Manager?

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answerhappygod
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Which method does a Cisco Unified 9971 phone use to send keep-alive messages to Cisco Unified Communications Manager?

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Which method does a Cisco Unified 9971 phone use to send keep-alive messages to Cisco Unified Communications Manager?

A. SIP NOTIFY with Event set to keep-alive
B. SIP OPTIONS
C. SIP REGISTER with Expires set to zero
D. SCCP StationRegister
E. SCCP StationServerReq
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