What is data usage during VoIP calls ?

      Making VoIP calls will use part of your monthly broadband data quota (if you have it from your ISP (Internet Service Provider)). Typical ISPs only count downloads in customer's broadband allowance (which represents ONE side of the conversation). If an ISP counts both uploads and downloads (represents BOTH sides of the conversation) then that customer's data quota is used up at twice the rate.

      Depending on used codec (can be manually tuned in your equipment/software setup) you may choose the speech quality on your calls generally in order to reduce the impact on download data quota. System usually designed to allocate codec to provide the best available voice quality.

      VoIP calls can typically use 10 MB to 40 MB (approximate figures) from the download quota for every hour of calls.