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libresbc

★ 483 Open GitHub ↗

An open source Session Border Controller 🌟 The SBC you dream about 🗽 LibreSBC will help you save thousands of dollars.

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<h1 align="center">LibreSBC</h1>
<h2 align="center">The Open Source Session Border Controller</h2>
<p align="left"><b>LibreSBC is a open-source Session Border Controller provide robust security, simplified interoperability, advanced session management, high performance, scale of carrier-grade and reliability for voice over IP (VoIP) infrastructures. LibreSBC designed to typically deployed at the network edge, the demarcation points (borders) among networks/environments.</b><br></p>

<br>

<h2>Contributing</h2>
All kinds of contributions are very welcome and appreciated !

If you want to contribute time to LibreSBC then here's a list of suggestions to get you started :

1. Star 🌟 the project.
2. Help people in the [issues](https://github.com/hnimminh/libresbc/issues) by sharing your knowledge and experience.
3. Find and report issues.
4. Influence the future of LibreSBC with feature requests.

**You can also contribute money to help secure LibreSBC's future.**

<p align="center">
  <a href="https://www.paypal.com/paypalme/hnimminh" target="_blank">
    <img src="https://user-images.githubusercontent.com/58973699/130890970-ad7f3be3-42c4-4a21-8e28-27dda9c603e3.png" height="54" alt="Paypal">
  </a>
</p>
<br>
<p align="center"> 
  <br><strong>Bitcoin Wallet</strong>
  <br>1MNjpx5Jy9KUxx2gt5qVmExruehgPi3dQX
</p>

<br>

## Sponsors

*Special thanks to*

<div align="center"><table cellpadding="5"><tbody align="center">
  <tr>
    <td>
      <a href="#">
      <img src="https://user-images.githubusercontent.com/58973699/198862008-3fd45e93-b8ea-4768-ba26-bc81bb925127.png" width="172" alt="Youph.one"><br/>
      <b>Your app, enterprise-ready.</b><br/>
      <sup>call center in you hand</sup>
      </a>
    </td>
    <td>
      <a href="http://www.shiblysolution.com">
      <img src="https://user-images.githubusercontent.com/58973699/198830637-3ceb8588-6a3c-46a0-8b7b-d33bfbe6bb14.png" width="128" alt="keygen"><br/>
      <b>Leading integrations & services</b><br/>
      <sup>marked its flagship in South-East Asia.</sup>
      </a>
    </td>
    <td>
      <br>
      <a href="https://www.courzad.com/">
      <img src="https://user-images.githubusercontent.com/58973699/262483673-ef831ad5-c90f-41f8-84c1-6abac4b82d05.png" width="128" alt="keygen">
      <br/><br>
      <b>Your partner to Open</b><br/>
      <sup>Cloud-Native 4G/5G Mobile Network.</sup>
      </a>
    </td>
  </tr>
</tbody></table></div>
<br>

## Table of Contents
- [Why](#why)
- [Architecture](#architecture)
- [Functions](#functions)
  - [Connectivity & Compatibility](#connectivity-&-compatibility)
  - [Security](#security)
  - [Quality of service](#quality-of-service)
  - [Media services](#media-services)
  - [Intergration](#intergration)
  - [High Avaibility](#high-avaibility)
- [Documents](#documents)
- [Roadmap](#roadmap)
- [Discussions](#discussions)
- [Community](#community)
- [Who use LibreSBC](#who-use-libresbc)
- [Performance Test](#performance-test)
- [License](#license)

<br>

## Why
* Free & Open: It's free and always free for everyone
* Comunity & Majoirity: Standing on the shoulders of giants, Kamailio and FreeSWITCH
* Customisability: Make it do what you want
* Capability: Carrier-grade

## [Roadmap](https://github.com/hnimminh/libresbc/issues/123)

## Architecture
![Image](https://github.com/user-attachments/assets/8e2a9488-9827-4861-9cf3-ce7724d7898f)

## Functions
SBCs commonly maintain full session state and offer the following functions:

### Connectivity & Compatibility
Allow multiple networks to communicate through the use of a variety of techniques such as:
* Advanced [NAT](https://en.wikipedia.org/wiki/Network_address_translation) Traversal Capabilities
* [SIP](https://en.wikipedia.org/wiki/Session_Initiation_Protocol) normalization, SIP message and header manipulation
* Call Party Translatation
* [VPN](https://en.wikipedia.org/wiki/Virtual_private_network) connectivity
* Protocol translations between [UDP](https://en.wikipedia.org/wiki/User_Datagram_Protocol), [TCP](https://en.wikipedia.org/wiki/Transmission_Control_Protocol) & [TLS](https://en.wikipedia.org/wiki/Transport_Layer_Security)
* Powerful built-in routing engine.
* Allowing control routing by 3rd-party software via [HTTP](https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol)
* Dynamic Load Balancing, Failover, Distribution
* IPv4/IPv6 Dual Stack
 
### Security:
Protect the network and other devices from:
* Malicious attacks such as a denial-of-service attack ([DoS](https://en.wikipedia.org/wiki/Denial-of-service_attack)) or distributed DoS
* Toll fraud via rogue media streams
* SIP Malformed Packet Protection
* Topology hiding by back to back user agent ([B2BUA](https://en.wikipedia.org/wiki/Back-to-back_user_agent))
* Encryption of signaling (via TLS) and media ([SRTP](https://en.wikipedia.org/wiki/Secure_Real-time_Transport_Protocol))
* Access Control List
* Auto Control Network Firewall
* SIP Firewall Level

### Quality of service 
The [QoS](https://en.wikipedia.org/wiki/Quality_of_service) policy of a network and prioritization of flows is usually implemented by the SBC. It can include such functions as:
* [Rate limiting](https://en.wikipedia.org/wiki/Call_volume_(telecommunications)) include call per second (cps), concurrent calls (concurency)
* Traffic Optimization by [token bucket](https://en.wikipedia.org/wiki/Token_bucket) and [leaky bucket](https://en.wikipedia.org/wiki/Leaky_bucket)

### Media services
Offer border-based media control and services such as:
* Media encoding/decoding ([SRTP](https://en.wikipedia.org/wiki/Secure_Real-time_Transport_Protocol)/[RTP](https://en.wikipedia.org/wiki/Real-time_Transport_Protocol))
* [DTMF](https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling) relay and interworking include In-Band Signaling (touch tones), Out-of-Band Signaling ([RFC2833](https://www.ietf.org/rfc/rfc2833.txt)) and SIP INFO Method
* Media Codec transcoding: [G711A/U](https://en.wikipedia.org/wiki/G.711), [G729](https://en.wikipedia.org/wiki/G.729), [OPUS](https://en.wikipedia.org/wiki/Opus_(audio_format)), [AMR](https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec), [G.722.2 AMR-WB](https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_Wideband)
* Tones and announcements (Early Media)
* Data and fax interworking
* Support multiple Media mode: Proxy, Bypass, Transcode
* Voice Activity Detection [VAD](https://en.wikipedia.org/wiki/Voice_activity_detection)
* Confort Noise Generation [CNG](https://en.wikipedia.org/wiki/Comfort_noise)

### Intergration
Support to intergrate with 3rd-party system or customer function easily
* Flexible JSON for Call Detail Record ([CDR](https://en.wikipedia.org/wiki/Call_detail_record)), Send CDR to HTTP API, enabling customized/3rd-party usage such as databases, data analysis or billing purpose. 
* Customization routing mechanism via HTTP API
* Network capture support: Live Capture and Intergrated with [Homer](https://sipcapture.org/)

### High Avaibility
* [Distributed System](https://en.wikipedia.org/wiki/Distributed_computing)
* Active-Active [Cluster](https://en.wikipedia.org/wiki/Computer_cluster) Concept (_under development_)
* Healthcheck and Failure Autodetection

## Documents
Please go to [Wiki](https://github.com/hnimminh/libresbc/wiki)

## Discussions
* Let development [Discuss](https://github.com/hnimminh/libresbc/discussions)

## Who use LibreSBC
On my awareness, here is the list of them
* [Youphone](http://youph.one/)
* [ShiblySolution](http://www.shiblysolution.com/)
* [Orange](https://www.orange.com/)
* [LinkMobility](https://www.linkmobility.com/)
* [Courzad](https://www.courzad.com/)

## Performance Test
* System Under Test
  * OS: Debian 4.19.132-1 x86_64 (10.6)
  * CPU: Intel(R) Xeon(R) CPU X5670  @ 2.93GHz
  * RAM: 8GB; SSD: 128GB
* Result:
  * 50 call per second, 1000 concurent call
  * Used Memory: 1730M, CPU Load: 26%, Call Duration: 600 seconds

## License
[MIT](./LICENSE)

libresbc

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