When dialing any external SIP URI for a business-to-business call, an endpoint that is registered to the Cisco VCS Contr

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When dialing any external SIP URI for a business-to-business call, an endpoint that is registered to the Cisco VCS Control fails to locate the remote endpoint. The same endpoint can successfully call another endpoint that is registered to the Cisco VCS Expressway. How do you resolve this issue?

A. Add traversal call licensing on the Cisco VCS Expressway.
B. Add traversal call licensing on the Cisco VCS Control.
C. Add a multisite option to the endpoint.
D. Configure a proper DNS zone on the Cisco VCS Expressway.
E. Configure a traversal zone between the Cisco VCS Control and the Cisco VCS Expressway.
F. Configure a SIP route pattern in Cisco Unified Communications Manager.