400-051 Exam Dumps | Which method does a Cisco Unified 9971 phone use to send keep-alive messages to Cisco Unified Communications

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Question 74/263

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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