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Sangoma D500 Transcoding Cards

The D500 is compatible with both Asterisk and FreeSWITCH. These applications can use Sangoma's compatible drivers to use the D500 cards as seamless voice transcoding resources. Developers and integrators can also use the Transcoding API in C to create their own applications.

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The Sangoma D500 card converts multiple concurrent channels of transcoding from one type of codec (e.g., G.711) to another (e.g., G.729) without affecting latency or consuming valuable host CPU resources. The card supports up to 2000 sessions of any-to-any voice codec conversion at unrivaled quality1. All codecs are fully insured, and no additional licensing is required to use them.

To save bandwidth, most IP telephony applications require the use of multiple types of voice codecs, which are used to digitally compress voice signals. While voice signals from the PSTN are always in the form of the G.711 codec, VoIP terminal equipment, and networks support a variety of other voice codecs such as G.729, G.726, AMR, G.722, iLBC, and so on. Most VoIP infrastructure must include the ability to mediate between endpoints that support different codecs, but this functionality frequently necessitates digital signal processing tasks that are expensive, resource-intensive, and can degrade voice signal quality if too much latency and delay are introduced.


  • There are no licensing fees.
  • It is compatible with Asterisk and FreeSWITCH.
  • It runs on both Linux and Windows.
  • C API is simple.
  • PCI Express stands for Peripheral Component Interconnect.

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