ISP & Internet connection
We recommend ADSL or Cable ISP connections with 128Kbps or greater upstream bandwidth. If your modem/router provides QoS, you can use a minimum 64Kbps upstream bandwidth (e.g. a basic 256/64 ADSL) - though you may still noice poor voice quality on calls when the G.711 codec is used.
Note that VoIP conversations are data on your ISP account, and count towards data limits. Depending on the codec used, a VoIP call can take up to 64Kbps or almost 1MB per 2 minutes ! Because ISP bandwidth throttling (after monthly allowance reached) will affect your VoIP service, we recommend that you monitor your bandwidth usage, and change to a plan with more included bandwidth if necesssary. See Codecs for info on how much data is used for a VoIP call.
ISP blocking ports may affect the VoIP service.
NAT / router / firewall device requirements / Compatibility issues
Your NAT router / firewall needs to allow voice calls to pass through, and redirect them to your VoIP device. This is achieved by several methods:
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