In a SIP-enabled contact center deployment which protocol is used to connect the Application Enablement Service (AES) and Contact Center Manager Server (CCMS)?

Refer to the Exhibit.

In a SIP-enabled contact center deployment which protocol is used to connect the Application Enablement Service (AES) and Contact Center Manager Server (CCMS)?
A . TCP
B . STP
D . 323
E . AML
F . TR87/TLS

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Answer: B