basic
32kadpcm
vnd.qcelp
vnd.digital-winds
vnd.lucent.voice
vnd.octel.sbc
vnd.rhetorex.32kadpcm
vnd.vmx.cvsd
vnd.nortel.vbk
vnd.cns.anp1
vnd.cns.inf1
L16
vnd.everad.plj
telephone-event
tone
prs.sid
vnd.nuera.ecelp4800
vnd.nuera.ecelp7470
mpeg
parityfec
MP4A-LATM
vnd.nuera.ecelp9600
G.722.1
mpa-robust
vnd.cisco.nse
DAT12
L20
L24