210-065 Question #300: Real Exam Question with Answer & Explanation

The correct answer is A: REFER. A Multiway call escalation uses the SIP REFER method to instruct a participant's endpoint to join an external conferencing bridge.

Question

When a Multiway call excalation happens, which SIP message is sent?

Options

AREFER
BTRANSFER
C200 OK
DREDIRECT

Explanation

A Multiway call escalation uses the SIP REFER method to instruct a participant's endpoint to join an external conferencing bridge.

Common mistakes.

B. TRANSFER is not a valid SIP method; call transfer in SIP is accomplished using the REFER method combined with a Refer-To header.
C. 200 OK is a success response code, not a request method, and cannot initiate a call escalation.
D. REDIRECT is not a SIP request method; call redirection in SIP is handled by 3xx response codes, not a message named REDIRECT.

Concept tested. SIP REFER method in Multiway call escalation

Reference. https://www.cisco.com/c/en/us/support/docs/unified-communications/telepresence-multiway/116025-configure-multiway-00.html

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