When an Avaya SIP Telephone (AST) makes a call to another AST on the same Avaya Aura® Communication Manager (CM), when is a SIP trunk used?

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When an Avaya SIP Telephone (AST) makes a call to another AST on the same Avaya Aura® Communication Manager (CM), when is a SIP trunk used?
A . up to the point where calls are shuffled to establish a direct media path
B . just during call establishment and clear down only
C . for the entire duration of the call
D . only when the media path is established

Answer: B