Which protocol is used for sending Feature Buttons and Dial Plan information to an Avaya Aura® Communication Manager controlled SIP Endpoint, also known as Avaya SIP Telephone (AST)?

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Which protocol is used for sending Feature Buttons and Dial Plan information to an Avaya Aura® Communication Manager controlled SIP Endpoint, also known as Avaya SIP Telephone (AST)?
A . STUN/TURN
C . 248
D . Personal Profile Management (PPM)
E . Session Description Protocol (SDP)

Answer: C