3GPP Message Decoder

3GPP message decoder is a very simple but powerful tool to decode GSM, UMTS, LTE, IP messages. This is developed by protocolanalyze. 3GPP decoder is a simple application using Wireshark to decode messages.

3GPP Message Decoder has a very simple interface.

MessageDecoderextended thumb 3GPP Message Decoder

The user interface has the following sections:

  • Enter the HEX message to decode in the top text area.
  • You can choose between GSM, WCDMA, LTE or IP Protocol.
  • Use the dropdown to select between different message types to select.
  • The decode button.
  • Decoded message window

MesageTypetoSelect thumb 3GPP Message Decoder

Message Type Supported

3GPP Message Decoder supports the following message types.

GSM

  • GAN TCP
  • GAN UDP
  • GSM CCCH
  • GSM SACCH
  • LLC
  • NAS
  • SNDCP
  • SNDCPXID

UMTS

  • NAS
  • RRC BCCH.BCH
  • RRC BCCH.FACH
  • RRC DL.CCCH
  • RRC DL.DCCH
  • RRC DL.SHCCH
  • RRC MCCH
  • RRC MSCH
  • RRC PCCH
  • RRC UL.CCCH
  • RRC UL.DCCH
  • RRC UL.SHCCH
  • RRC SIs (SIBs and MIB)

LTE

  • RRC BCCH.BCH
  • RRC BCCH.DL.SCH
  • RRC DL.CCCH
  • RRC DL.DCCH
  • RRC PCCH
  • RRC UL.CCCH
  • RRC UL.DCCH
  • NAS EPS

IP Protocols

  • ICMP
  • IP
  • RTSP
  • RTP
  • UDP

Decoding Message

After entering a correct hex string and choosing the appropriate option press the decode button to decode the message. You can copy (Ctrl A and Ctrl C) and paste (Ctrl V) the output result from the output window to a notepad or word processor.
decoded thumb 3GPP Message Decoder

Download 3GPP Message Decoder

Download 3GPP Message Decoder from the following link:

Download 3GPP Decoder

email
  • Shanti Sharma

    Your Comments
    The link to decoder does not work. Would you please send the decoder, I believe you have developed, via email.

    Thanks
    Shanti

  • http://www.3glteinfo.com 3gLteInfo

    Hi Shanti,

    The decoder is updated now. Get the new decoder @

    http://protocolanalyze.com/sites/all/files/Download/Decoder-0.6-Setup-win32.exe

  • http://YourWebsite Sanj

    Thanks for the decoder link.

    I am new to 3gpp tech, I would like to know how I can capture or create hex logs from the phone, or what tool to be used. So that I can see the msg flow for video call.

    I am curious to check Over the Air message logs of my Nokia 3g handset.

    I am very well aware of CDMA decoders like QXDM which has options to capture Over the air logs.

  • http://YourWebsite gtf

    Thanks, this is useful.

    Is it possible in the future to include RANAP protocol?

  • http://www.3glteinfo.com 3gLteInfo

    We are looking for new areas all the time. If we can get some contributors to write on this the definitely we will add to 3gLteInfo

  • http://www.3glteinfo.com Prashant Panigrahi

    Hi Sanj,

    The decoder is a program only to decode the PDUs. This can not capture any air interface logs.

  • http://YourWebsite Shanti Sharma

    Your Comments:

    I was wondering did you get any response to capture message log over over the air? If yes, would you please share what kind of sensor used to capture the message?

  • http://YourWebsite Eric

    I cannot access the website.. is the decoder still available?

  • http://sora-blue.net/~YuYong/ YuYong

    It seems link for decoder tool does not work.

    By the way, I also developed the similar tool but my tool is WEB application.
    http://sora-blue.net/~YuYong/

    My tool support message composing functionality too.

  • http://www.3glteinfo.com 3gLteInfo

    There are some problem with the decoder website. I mailed the developer. Hopefully he will respond back.

    In the mean time if someone need the decoder please mail us on contact@3glteinfo.com

  • http://www.3glteinfo.com 3gLteInfo

    Hi Eric,

    Send us a mail to contact@3glteinfo.com. We will send you a copy of the decoder.

  • http://YourWebsite Madhu Nadig

    Please send me the 3gpp Message decoder. I am not able to download from the website mentioned.

  • http://Linknotworking Raaj

    Hi

    The decoder link is not working.Please help me getting the decoder software.

    Thanks
    Raaj

  • http://Linknotworking Raaj

    Hi
    The decoder link is not working.Please help me getting the decoder software.
    Thanks
    Raaj

  • http://www.3glteinfo.com 3gLteInfo

    Hi All,

    Sorry for the late reply.

    I did not get a response from the developer. Please get the last released version from here:

    http://dl.dropbox.com/u/3872605/Decoder-0.6-Setup.exe

  • http://YourWebsite YuYong

    Thank you very much for uploading of the decoder.

    I confirmed decoder. I think it works but would you please tell me how I can indicate the each 3GPP version (R99, Rel4/5/6/7/8/9/10…)?
    For example, I confirmed GSM RR’s message PDU but it seems this decoder only supports rel6 on unknown revision.
    For the LTE functionality, supporting of rel8 is necessary, I think.

    Also, I confirmed UMTS BCCH-BCH-Message but would you please tell me how I can decode the payload message in BCCH-BCH-Message?

  • http://YourWebsite YuYong

    More questions.
    For GSM RLC/MAC message, how following messages can be decoded on this decoder?

    Packet DBPSCH Downlink Ack/Nack (11.2.26b in TS40.060)
    Packet DBPSCH Downlink Ack/Nack Type 2 (11.2.28c in TS40.060)
    Packet DBPSCH Uplink Ack/Nack (11.2.28a in TS40.060)
    Packet DBPSCH Uplink Ack/Nack Type 2 (11.2.28b in TS40.060)

    Since MESSAGE_TYPE value for these message are same as Packet Downlink Ack/Nack or Packet Uplink Ack/Nack so it seems this decoder cannot distinguish.

    Also, does this decoder support EGPRS RLC Block?

  • http://YourWebsite YuYong

    I’m sorry to bother you many times but does this decoder support ASN.1 part in L3 SS message which is defined in 3GPP TS24.080?

    I tried following PDU which is Facility(Downlink) message on this decoder but it seems this decoder does not decode the ASN.1 part.

    033A2BA28002017B308002010AA08004012A30803080830110840107850581003421438701050000000000000000

  • http://www.3glteinfo.com 3gLteInfo

    Hi all,

    New link is added now for the decoder program.

    http://3gppdecoder.free.fr/

  • http://www.3glteinfo.com 3gLteInfo

    I think SS is not supported in the decoder. I will talk to the developer on this issue.

  • http://YourWebsite YuYong

    It seems GAN message is not fully supported.
    I tried following PDU but content of PS Handover to GERAN Command IE is not decoded and payload SI message in PS Handover to GERAN SI IE is not decoded.
    Those are decoded as just “DATA”.

    00460210000000006C04000404006F3014000000000000000000000000000000000000000011000000000000000000000000000000012A088000000000000002

    Even if there is no mechanism to perform the detail decoding for those IE, at least decoder should specify a OCTET string for those IE data, I think.

  • Gabriel Shin.

    is this freeware ?
    so is it no problem to use at the company ?

  • http://www.3glteinfo.com 3gLteInfo

    Yes it is a Open source decoder.

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