Audio Codecs:

  • GSM – 13 Kbps (full rate), 20ms frame size.
  • iLBC – 15Kbps,20ms frame size: 13.3 Kbps, 30ms frame size.
  • ITU G.711 – 64 Kbps, sample-based. Also known as A-law/μ-law.
  • ITU G719 – 32/48/64/128 Kbps, 28 ms Frame Size.
  • ITU G.722 – 48/56/64 Kbps.
  • ITU G.723.1 – 5.3/6.3 Kbps, 30ms frame size.
  • ITU G.726 – 16/24/32/40 Kbps.
  • ITU G.728 – 16 Kbps.
  • ITU G.729 – 8 Kbps, 10ms frame size.
  • Speex – 2.15 to 44.2 Kbps.
  • LPC10 – 2.5 Kbps.
  • DoD CELP – 4.8 Kbps.


Codecs influence call quality and bandwidth usage.


We recommend devices that allow you to use G729 codec.