VoIP Transcoding

VoIP Transcoding

Transcoding refers to the conversion of call media from one voice encoding algorithm (also known as a codec or a vocoder) to another. This is performed in order to bridge differences in capabilities between the telecommunications systems supporting the calling and the called parties. For example, when the two end point devices involved in a call don’t share a common vocoder among their vocoder sets.

TelcoBridges devices support transcoding among a number of popular voice codecs whether during calls from TDM-to-IP networks, IP-to-TDM networks or IP-to-IP networks featuring different end-point device capabilities.

Supported Codecs include:

• Universal codecs
  • G.711 – Supported packet durations: 20,30,40,50 and 60 msec
  • G.723.1 – Supported packet durations: 30,60 and 90 msec
  • G.726 – Supported packet durations: 20,30,40,50 and 60 msec
  • G.729a/ab – Supported packet durations: 20,30,40,50,60,70 and 80 msec
  • T.38

• Wireline codecs
  • G.728 – Supported packet durations: 20,30,40,50 and 60 msec
  • G.729eg – Supported packet durations: 20,30,40,50,60,70 and 80 msec
  • iLBC – Supported packet durations: [13kbps] 30 and 60 msec, [15kpbs] 20 and40 msec

• Wireless codecs
  • AMR – Supported packet durations: 20,40,60 and 80 msec
  • GSM-FR – Supported packet durations: 20 and 30 msec
  • GSM-EFR – Supported packet durations: 20,40 and 60 msec
  • EVRC – Supported packet durations: 20,40 and 60 msec
  • QCELP – Supported packet durations: 20,40 and 60 msec
  • G.722.2 (AMR-WB) – Supported packet durations: 20,40,60 and80 msec