VoIP telephony requires an active internet connection to make and receive calls, since voice communication is transmitted digitally over IP networks instead of traditional telephone lines.
This guide explains the recommended internet speed, bandwidth requirements, and QoS settings needed for reliable VoIP service quality.
VoIP Bandwidth Requirements
We recommend having a broadband connection (such as ADSL) with a minimum speed of 512 Kbps to ensure good VoIP service quality.
The required bandwidth* is approximately 50–100 Kbps per voice channel, depending on your connection’s upload speed and the codec used.
If you plan to use the same connection for additional activities (such as web browsing, file downloads, etc.), you should ensure that sufficient bandwidth is available for all services, including VoIP telephony.
To achieve this, your equipment (routers/switches) should support and be properly configured with QoS (Quality of Service) settings, prioritizing voice traffic over other types of data.
* Bandwidth: The rate of data transfer within a network.