Cisco 400-051 Exam

A collaboration engineer has been asked to implement secure real-time protocol between a Cisco Unified CM and its SIP gateways. Which option is a consideration for this implementation?

  • A. SRTP is supported only in Cisco IOS 15.x and higher
  • B. Only T.38 and Cisco Fax protocols are supported.
  • C. Call hold RE-INVITE is not supported.
  • D. SIP requires that all times be sent in GMT
Answer: Option D.

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