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Fixed RTP Payload Types:

0 | u-Law, 8bit, mono, 8kHz
8 | A-Law, 8bit, mono, 8kHz
10 | PCM, 16bit, MSB first, signed, 44.1kHz stereo, left channel first
11 | PCM, 16bit, MSB first, signed, 44.1kHz mono
14 | any MPEG audio
96 | PCM, 16bit, MSB first, signed, 8kHz mono
97 | u-Law, 8bit, mono, 24kHz
98 | A-Law, 8bit, mono, 24kHz
99 | PCM, 16bit, MSB first, signed, 24kHz mono
100 | u-Law, 8bit, mono, 32kHz
101 | A-Law, 8bit, mono, 32kHz
102 | PCM, 16bit, MSB first, signed, 32kHz mono
103 | PCM, 16bit, MSB first, signed, 48kHz stereo, left channel first
104 | PCM, 16bit, LSB first, signed, 8kHz mono
105 | PCM, 16bit, LSB first, signed, 24kHz mono
106 | PCM, 16bit, LSB first, signed, 32kHz mono
107 | PCM, 16bit, LSB first, signed, 44.1kHz stereo, left channel first
108 | PCM, 16bit, LSB first, signed, 48kHz stereo, left channel first
109 | u-Law, 8bit, mono, 12kHz
110 | A-Law, 8bit, mono, 12kHz
111 | PCM, 16bit, MSB first, signed, 12kHz mono
112 | PCM, 16bit, LSB first, signed, 12kHz mono