Oracle Communications Session Border Controller — Question 61

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

Answer options

• 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

Correct answer: C

Explanation

The correct answer is C, as the generation of a local ring-back tone indicates to the caller that the call is being processed and is ringing on the recipient's end. The other options do not directly correlate with the UAC sending a 180 Ringing response; for instance, the SIP presence service subscription (A) and SIP session termination (E) are unrelated to the ringing state.