Which two SIP requests are used to allow an AST endpoint to use features provided by an Avaya Aura ® Communication Manager (CM)? (Chose two).

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Which two SIP requests are used to allow an AST endpoint to use features provided by an Avaya Aura ® Communication Manager (CM)? (Chose two).
A . INVITE
B . OPTIONS
C . REGISTER
D . SUBSCRIBE
E . NOTIFY

Answer: D,E

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