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
Hi,
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.
Cheers,
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
Apart from the codec patches for ETSI codec i cant find any other voice decoding source code in osmocom-tetra trunk. Neither seems to have entered you in the AUTHORS file.
FAQ on the site says:
"Can your software actually play the voice signal?
Currently we have no support for that. However, a yet unreleased proof-of-concept version exists."
Why this secrecy for publishing source to decode unencrypted networks?. Have osmocom been threatened by the tetra manufacturers? Would damage sysmocom commercial interests
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
On 09/24/2011 03:37 PM, Mccauley wrote:
Why this secrecy for publishing source to decode unencrypted networks?. Have osmocom been threatened by the tetra manufacturers? Would damage sysmocom commercial interests
Hi,
sysmocom is building a GSM BTS, right now there is no interest in doing something commercially with tetra.
We can not integrate the ETSI audio code in our (A)GPL software, the result would not be freely distributable. From my side I was mostly interested in the signalling part, or if time would permit try transmitting.
So if you either find a legal way to include the ETSI code at build time, or preferable write a GPL compatible audio decoder, I think we would be happy to include it in the git repository.
cheers holger
-
Dieter Spaar -
Holger Hans Peter Freyther -
Mccauley -
Pepijn van den Berkhof