The upload speed of your broadband Internet connection is critical to ensure good quality VoIP conversations. There are two main voice codecs used for voice conversations using VoIP; G.711 and G.729, with G.711 being the best quality (ideal for businesses) but also taking up the most bandwidth requirements. This diagram shows the different VoIP codecs with packet information and bandwidth requirements.
Even though it’s a nice feeling to use a high quality voice codec we recommend the traditional codec of G.729 because of it’s low packet size. If you are feeling a little nerdy, why not do a speedtest and see how fast your Internet is and how many concurrent calls you can have using VoIP.