The instructions to download the ETSI reference codec can be found here: http://tetra.osmocom.org/trac/wiki/Speech_Codec although I never got it working completely. There is an output stream but there is no audio data in it. Just (random?) clicks and pops.

Pepijn

Op 23 sep. 2011, om 15:20 heeft Dieter Spaar het volgende geschreven:

Hello Bigsat,

On Fri, 23 Sep 2011 13:49:43 +0200, "Bigsat" <bigsat@gmail.com> wrote:

Is it possible to release some part of the code necessary to decode
Tetra voice or give some explaination of Gsmtap usage ?

Just in case, I have sent my "proof of concept" modification
for voice decoding to the authors of Osmocom TETRA for proper
integration a while ago. As far as I am aware the current
source code should be able to decode voice or at least contain
the instructions how to do it (the ETSI reference codec is most
certainly not included for copyright reasons).

Best regards,
Dieter
--
Dieter Spaar, Germany spaar@mirider.augusta.de