Refer to the exhibit.
The SDP offer/answer has been completed successfully but there is no DTMF when users press keys.
What is the cause of the issue?
A . DTMF was negotiated properly in these messages.
B . G.729 rather than G.711ulaw was negotiated.
C . Payload type 110 was negotiated rather than type 101.
D . DTMF was not negotiated on the call.
Answer: D
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