Which option best are SIP methods that can be used to pass DTMF tones? (Select 3 answers)
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/12-4t/sip-12-4t-book/voi-sip-dtmf.html#GUID-0E228A53-4405-4730-8D54-B37979E69A8B
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