SIP calls

Audio Codecs

By default, SIP calls will be presented to your SIP servers with the G.711 audio codec as the suggested default.

Recommended Codecs

If your SIP equipment allows you to set supported audio codecs, we recommend that you only enable the following:

  • G.711 A-law
  • G.711 U-law
  • G.729

Other Supported Codecs

Our system also supports the following codecs – though these have not been thoroughly tested.

  • L16
  • GSM
  • Speex
  • iLBC
Phone numbers purchased from our old provider (before December-2018) only support G.711 A-law/U-law and G.729 for incoming calls.