How Much Bandwidth Does VoIP Use? Posted on by Webmaster IT Support Forum › Forums › Telephony › General Discussion › How Much Bandwidth Does VoIP Use? Tagged: Bandwidth, VoIP This topic has 0 replies, 1 voice, and was last updated 8 years ago by Webmaster. Viewing 0 reply threads Author Posts December 3, 2015 at 11:09 am #1479 WebmasterKeymaster Want to know how much bandwidth VoIP uses? VoIP uses about 90Kb/s per VoIP phone. So if you have 10 phones, you’ll need 900Kb/s available. Author Posts Viewing 0 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In