In Key Press Markup Language, which SIP request is used to deliver the actual DTMF digits?
A. SUBSCRIBE
B. INFO
C. NOTIFY
D. INVITE
E. ACK
In Key Press Markup Language, which SIP request is used to deliver the actual DTMF digits?
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answerhappygod
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In Key Press Markup Language, which SIP request is used to deliver the actual DTMF digits?
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