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When a UC Administrator is troubleshooting DTMF negotiated by this SIP INVITE, which two messages should be examined next to further troubleshoot the issue?
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.)
A . PRACK
B . UPDATE
C . SUBSCRIBE
D . NOTIFY
E . REGISTER
Answer: C,D
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