This blog post will explain how much bandwidth is used for VoIP calls. VoIP is a technology that allows someone to make or receive calls over the Internet. Audio that is generated from one side of a VoIP call is broken up into packets of digital information. That digital information is sent to the other side of a VoIP call so that person can hear it. Codecs are responsible for assembling the data packets to create the audio the other side hears. Since an SIP phone system uses the Internet, a certain amount of data will be consumed depending on which codec is used. Most SIP phone systems use the G.711 codec. That codec is used a lot because there is no compression applied to the voice data. The quality of that voice data is equal to telephones. Data consumption for the G.711 codec is around 1.25 megabytes per minute for one side of the call. Meaning the data consumed for both sides of the call is around 2.50 megabytes per minute.