# System requirements

### Network Channel Requirement

An example of calculating the required channel bandwidth for different codecs for 30 simultaneous calls. PBX supports the most popular codecs:

* **G.711** - 4.67 Mbps
* **GSM** - 1.68 Mbps
* **G.722** - 4.67 Mbps
* **G.729** - 1.38 Mbps 

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The calculation is approximate, when using the same codec on all devices connected to the PBX. Read more [here](https://www.asteriskguru.com/tools/bandwidth_calculator.php).
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### Minimum system requirements

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We recommend using two hard drives for PBX deployment.
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* **800 Mb** hard disk for the main system 
* A **50+ Gb** hard drive for recording conversations 
* 1 (2 cores) **x86-64** processor 
* **2 GB** of RAM 
* Network Adapter

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A PC with such parameters, in our tests, holds **38 simultaneous incoming calls** under the conditions: 

* 10 agents are connected to the queue (all online) 
* Every second a new call comes in 
* Music (MOH) is played to the client while waiting 
* Modules on the PBX is not installed
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Approximately, **1 hour** of conversation takes up **14MB** of disk space. The recommended size for the disk storing call recordings is at least 50 gigabytes.
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