Four Linux softphones reviewed

The review of four Linux softphones has a useful table of the various codecs and their bandwidth requirements.

Softphone protocol and codec support

  Kiax Linphone Twinkle X-Lite
Protocol Support        
SIP No Yes Yes Yes
IAX Yes No No No
Codec Support        
G.711u 64 Kbps Yes Yes Yes Yes
G711a 64 Kbps No Yes Yes Yes
GSM 13 Kbps Yes Yes Yes Yes
iLBC 13.3-15.5 Kbps Yes With patch No Yes
Speex 2.15-44.2 Kbps Yes Yes No Yes
DoD 1015 2.4 Kbps No Yes No No

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