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1 Introduction

The Real-Time Transport Protocol (RTP/RTCP): DTMF Digits, Telephony Tones, and Telephony Signals Data Extensions Protocol (RTPDT) is an extension to [RFC4733]. RTPDT describes the payload format needed to carry DTMF digits, tones, and signals in RTP packets over a network transport.

Any behavior not explicitly defined in this document means the behavior defined in [RFC4733] must be used.

Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in RFC 2119. Sections 1.5 and 1.9 are also normative but cannot contain those terms. All other sections and examples in this specification are informative.

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