Which of the following are SIP methods that can be used to pass DTMF tones? (Choose 3 answers)
In-band method by encoding DTMF tone as regular RTP packets
In-band method by encoding DTMF tone as in specific RTP packets (RFC 2833)
Out-of-band method by encoding DTMF tone in SIP message (UPDATE method)
Out-of-band method by encoding DTMF tone in SIP message (MESSAGE method)
Out-of-band method by encoding DTMF tone in SIP message (INFO method)
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