Refer to the exhibit. The SDP offer/answer has been completed successfully but there is no DTMF when users press keys. W

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answerhappygod
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Refer to the exhibit. The SDP offer/answer has been completed successfully but there is no DTMF when users press keys. W

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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?
Refer To The Ex 1
Refer To The Ex 1 (101.39 KiB) Viewed 52 times
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.
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