English
资源说明：This memo defines two payload formats, one for carrying dual-tone
multifrequency (DTMF) digits, other line and trunk signals (Section
3), and a second one for general multi-frequency tones in RTP [1]
packets (Section 4). Separate RTP payload formats are desirable since
low-rate voice codecs cannot be guaranteed to reproduce these tone
signals accurately enough for automatic recognition. Defining
separate payload formats also permits higher redundancy while
maintaining a low bit rate.
The payload formats described here
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