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World's First Voice Call From a Free GSM Stack

Posted by timothy on from the but-it-takes-more-than-a-pdf-exploit dept.

zycx writes "As Dieter Spaar has pointed out in a mailing list post on the OsmocomBB developer list, he has managed to get a first alpha version of TCH (Traffic Channel) code released, supporting the FR and EFR GSM codecs. What this means, in human readable language: He can actually make voice calls from a mobile phone that runs the Free Software OsmocomBB GSM stack on its baseband processor. This is a major milestone in the history of the project."

2 of 83 comments (clear)

  1. GSM Full Rate patent by tepples · · Score: 4, Informative

    I thought the GSM voice codecs were patented by Philips, as described in this page about an otherwise Free implementation of GSM FR.

  2. Re:IMEI blacklisting practices by Gruturo · · Score: 4, Informative

    The white/black/grey lists are held in the EIR (Equipment Identity Register), which may or may not exist at all (it's optional, some providers don't have one) and is sometimes integrated within the HLR

    This is an explanation (a bit dated, but still) of how to decode manufacturer code, country code, approval code etc from the IMEI: http://www.cellular.co.za/ieminumbers.htm

    More info (just relevant stuff which came up googling "imei hlr eir"):
    http://www.linkedin.com/answers/technology/wireless/TCH_WIR/612218-35166861
    http://www.linkedin.com/answers/technology/wireless/TCH_WIR/608687-35166861
    http://www.wordiq.com/definition/HLR#EIR

    Brief description of the (global?) IMEI DB at the gsmworld site: http://www.gsmworld.com/our-work/programmes-and-initiatives/fraud-and-security/imei_database.htm

    --

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