Case study

bline: decoding LINE voice-call traffic

bline investigates an earlier LINE voice-call stack and supplies tools for its custom ZLIB-compressed SIP data. The repository includes a compression and decompression library, a command-line pipe utility and a Kaitai Struct definition for heartbeat messages.

Targets: App · Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06

Stars: 6
Last commit: 2020-07-04
Language: C
License (GitHub): MIT

GitHub data as of 2026-11-09

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Requirements & limits

Scope: The findings concern an earlier LINE voice-call stack that the author says was later rewritten.
Limits: The role of encryption and the audio payload format remain unexplained.
License: MIT License.

Cite

BibTeX

@misc{bline-line-voip-case,
  title = {{bline: decoding LINE voice-call traffic}},
  howpublished = {\url{https://github.com/thebabush/bline}},
  url = {https://github.com/thebabush/bline},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/bline-line-voip-case/}}
}

Plain text

bline: decoding LINE voice-call traffic. https://github.com/thebabush/bline (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/bline-line-voip-case/

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Primary sources

README.md GitHub · thebabush/bline · Revision 0b70696
LICENSE GitHub · thebabush/bline · Revision 0b70696