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Which action triggers the 180 Ringing response in a User Agent Client (UAC)?

Which action triggers the 180 Ringing response in a User Agent Client (UAC)?

A.

the subscription to a SIP presence service

B.

the generation of a remote ring-back tone

C.

the generation of a local ring-back tone

D.

the establishment of a SIP session

E.

the termination of a SIP session

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