350-801 Question #120: Real Exam Question with Answer & Explanation

The correct answer is C: SUBSCRIBE. The DTMF Events through SIP Signaling feature allows telephone event notifications to be sent through SIP NOTIFY messages, using the SIP SUBSCRIBE/NOTIFY method as defined in the Internet Engineering Task Force (IETF) draft, SIP-Specific Event Notification.

Protocols and Endpoints

Question

Refer to the exhibit. When a UC Administrator is troubleshooting DTMF negotiated by this SIP INVITE, which two messages should be examined next to further troubleshoot the issue? (Choose two.)

Options

APRACK
BUPDATE
CSUBSCRIBE
DNOTIFY
EREGISTER

Explanation

The DTMF Events through SIP Signaling feature allows telephone event notifications to be sent through SIP NOTIFY messages, using the SIP SUBSCRIBE/NOTIFY method as defined in the Internet Engineering Task Force (IETF) draft, SIP-Specific Event Notification.

Topics

#SIP Troubleshooting#DTMF#SIP Signaling#SUBSCRIBE/NOTIFY

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