Which statement about when user A calls user using SIP is true?

Refer to the exhibit. Which statement about when user A calls user using SIP is true?


A. SIP TCP/TLS ports must be opened from internal to DMZ and vice versa.
B. Cisco VCS Control and Cisco VCS Expressway support static NAT.
C. Deploying a Cisco VCS Control inside a NAT mandates the use of the Advanced Networking option key.
D. RT and RTCP ports must be opened at the firewall from internal to DMZ and vice versa.

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5 thoughts on “Which statement about when user A calls user using SIP is true?

  1. is the point of this question that the proxy nature of calls ONLY flow from Exp-E toward Exp-C but that the Control will NOT proxy a call out to the external DMZ user via the Exp-E

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