# 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.

- Type: Case study
- Targets: App · Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/thebabush/bline>
- Primary source: <https://github.com/thebabush/bline/blob/0b706968c1b8e61e7108748143b11a9ab7733e31/README.md>
- Catalog page: <https://awesomerea.org/resources/bline-line-voip-case/>
- Record JSON: <https://awesomerea.org/resources/bline-line-voip-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/bline-line-voip-case/index.md)

## 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.

## Primary sources

1. <https://github.com/thebabush/bline/blob/0b706968c1b8e61e7108748143b11a9ab7733e31/README.md>
2. <https://github.com/thebabush/bline/blob/0b706968c1b8e61e7108748143b11a9ab7733e31/LICENSE>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.