How are DTMF digits transported in RFC 2833?

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answerhappygod
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How are DTMF digits transported in RFC 2833?

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How are DTMF digits transported in RFC 2833?

A. In the RTP stream with the named telephone events payload format.
B. In the RTP stream with the regular audio payload format.
C. In SIP NOTIFY messages.
D. In SIP INFO messages.
E. In SIP SUBSCRIBE messages.
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