100001 audio     g723 (G.723.1)
100002 audio      gsm (GSM)
100003 audio     ulaw (G.711 u-law)
100004 audio     alaw (G.711 A-law)
100011 audio     g726 (G.726 RFC3551)
100006 audio    adpcm (ADPCM)
100019 audio     slin (16 bit Signed Linear PCM)
100007 audio    lpc10 (LPC10)
100008 audio     g729 (G.729A)
100009 audio    speex (SpeeX)
100016 audio  speex16 (SpeeX 16khz)
100010 audio     ilbc (iLBC)
100005 audio g726aal2 (G.726 AAL2)
100012 audio     g722 (G722)
100021 audio   slin16 (16 bit Signed Linear PCM (16kHz))
300001 image     jpeg (JPEG image)
300002 image      png (PNG image)
200001 video     h261 (H.261 Video)
200002 video     h263 (H.263 Video)
200003 video    h263p (H.263+ Video)
200004 video     h264 (H.264 Video)
200005 video    mpeg4 (MPEG4 Video)
400001  text      red (T.140 Realtime Text with redundancy)
400002  text     t140 (Passthrough T.140 Realtime Text)
100013 audio   siren7 (ITU G.722.1 (Siren7, licensed from Polycom))
100014 audio  siren14 (ITU G.722.1 Annex C, (Siren14, licensed from Polycom))
100017 audio  testlaw (G.711 test-law)
100015 audio     g719 (ITU G.719)
100028 audio  speex32 (SpeeX 32khz)
100020 audio   slin12 (16 bit Signed Linear PCM (12kHz))
100022 audio   slin24 (16 bit Signed Linear PCM (24kHz))
100023 audio   slin32 (16 bit Signed Linear PCM (32kHz))
100024 audio   slin44 (16 bit Signed Linear PCM (44kHz))
100025 audio   slin48 (16 bit Signed Linear PCM (48kHz))
100026 audio   slin96 (16 bit Signed Linear PCM (96kHz))
100027 audio  slin192 (16 bit Signed Linear PCM (192kHz))
100030 audio     opus (Opus Codec)
200006 video      vp8 (VP8 Video)
100018 audio    silk8 (SILK Custom Format 8khz)
100018 audio   silk12 (SILK Custom Format 12khz)
100018 audio   silk16 (SILK Custom Format 16khz)
100018 audio   silk24 (SILK Custom Format 24khz)

100002 audio      gsm (GSM)
100003 audio     ulaw (G.711 u-law)
100004 audio     alaw (G.711 A-law)
100012 audio     g722 (G722)