G723   GSM  ULAW  ALAW  G726 ADPCM SLINR LPC10 G729A SPEEX  ILBC
   G723     -     -     -     -     -     -     -     -     -     -     -
    GSM     -     -     2     2     6     2     1     9    32    27    28
   ULAW     -     5     -     1     6     2     1     9    32    27    28
   ALAW     -     5     1     -     6     2     1     9    32    27    28
   G726     -     8     5     5     -     5     4    12    35    30    31
  ADPCM     -     5     2     2     6     -     1     9    32    27    28
  SLINR     -     4     1     1     5     1     -     8    31    26    27
  LPC10     -     8     5     5     9     5     4     -    35    30    31
  G729A     -    10     7     7    11     7     6    14     -    32    33
  SPEEX     -     7     4     4     8     4     3    11    34     -    30
   ILBC     -     8     5     5     9     5     4    12    35    30     -

with

[speex]
quality => 2
complexity => 3
enhancement => true
vad => true
vbr => false
vbr_quality => 8
dtx => false