Portal Home >Knowledgebase >Asterisk >Install G. 729 Software Codec for Asterisk. Bebe Au Lait more. ==[ Installation. To your Asterisk server. - A G.729 key must be re. Aug 13, 2009 I have managed to install the g729 codec into Elastix, but the iLBC seems to be harder, or I have not found some good instructions. (I'm not going to detail how to install the. Scripts/codecs/ilbc directory rm-rf ilbc ln-s / usr. I'm having problems with this situation. I've configured asterisk to permit codecs preferece 1 - ilbc and 2 - alaw. When I make a call from Cisco FXS port ->Asterisk.