[](https://github.com/sippy/b2bua/actions?query=branch%3Amaster++)
# Sippy B2BUA
Sippy B2BUA is a [RFC3261](https://www.ietf.org/rfc/rfc3261.txt)-compliant
Session Initiation Protocol (SIP) stack and
[Back-to-back user agent](http://en.wikipedia.org/wiki/Back-to-back_user_agent) (B2BUA).
The Sippy B2BUA is a SIP call controlling component. Unlike a SIP proxy server,
which only maintains transaction state, the Sippy B2BUA maintains complete call
state and participates in all call requests. For this reason it can perform
number of functions that are not possible to implement using SIP proxy, such as
for example accurate call accounting, pre-paid rating and billing, fail over
call routing etc. Unlike PBX-type solutions such as Asterisk for example, the
Sippy B2BUA doesn't perform any media relaying or processing, therefore it
doesn't introduce any additional packet loss, delay or jitter into the media
path.
## Features
- 5,000-10,000 simultaneous sessions per server
- 150-400 call setups/tear-downs per second
- Real-time calls control and call data records (CDRs) generation
- Optional ability to use [Sippy RTPproxy](https://github.com/sippy/rtpproxy)
for media relaying
- Optional ability to perform Cisco-compatible RADIUS AAA (Authentication,
Authorization and Accounting)
- RFC3261 compliance
- Seamless compatibility with majority of popular SIP software and hardware on
the market today
- Robustness and Resilience
- Simple and clean, yet flexible, internal design making implementing new
features and services easy
- Sippy B2BUA could be easily combined with other Open Source software, such as
SIP Express Router / OpenSIPS to build complete softswitch solution
## Installation
### Install latest stable version
`pip install sippy`
### Install latest development version
`pip install git+https://github.com/sippy/b2bua`
## Running
To get started, you can use the b2bua_simple implementation. The following
example will cause the b2bua run in the foreground so you can see the SIP
messaging. If you make a call to the IP address of your host machine, the b2bua
will recieve the call on its UAC side, and it will send a new call leg out its
UAS side to the IP address 192.168.1.1. It is expected that 192.168.1.1 is some
sort of SIP switch or termination gateway.
`b2bua_simple -f -n 192.168.1.1`
## Documentation
See [documentation/documentation.md](documentation/documentation.md)
## Support us on Patreon!
Sippy B2BUA is available for use at the most liberal Open Source license
there is and we promise to keep it this way. If you like our software,
find it useful and want to support us moving it forward consider
becoming a patron here [Sippy Labs Patreon Page](https://www.patreon.com/sippylabs).
In turn, we would give a priority to bugs and feature requests from our
Patrons.
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