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?

Question

Options

• Aup to the point where calls are shuffled to establish a direct media path
• Bjust during call establishment and clear down only
• Cfor the entire duration of the call
• Donly when the media path is established

• B
  97% (28)
• D
  3% (1)

Explanation

Option B is correct because in an AST-to-AST call on the same CM, the SIP trunk only carries signaling messages - the INVITE, responses, and BYE - during setup and teardown. Once the call is established, the two ASTs exchange media (RTP) directly with each other, so the SIP trunk is completely idle for the duration of the conversation.

Why the distractors are wrong:

• A is misleading because "shuffling" is an H.323 concept where media initially flows through an intermediary before being redirected; AST SIP calls don't use the trunk for media even temporarily, so there's nothing to shuffle.
• C is wrong because keeping a SIP trunk occupied for the entire call would waste trunk resources - CM is designed to free the trunk after signaling is complete.
• D inverts the truth; the trunk is active before media is established (during signaling), not only when media is flowing.

Memory tip: Think of the SIP trunk as a phone operator who connects your call and then hangs up - it does the setup work and the goodbye, but stays out of your actual conversation. "Hello + Goodbye = B."

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