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What are the upstream and downstream requirements for Voice Over IP?

Written by on November 7, 2009 · 2 Comments

I’m trying to determine if a 1 Mbps downstream and 512 kbps upstream is sufficient for a 5 person office. The network needs to be able to handle multiple calls at the same time.

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2 Responses to “What are the upstream and downstream requirements for Voice Over IP?”

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  1. steven25t says:
    November 7, 2009 at 12:56

    get to these links.

  2. No Name says:
    November 7, 2009 at 13:23

    assuming you’re also going to use the internet, you need to upgrade, consider a fios connection (verizon) great service. it all depends on compression the service is using, here is a calculator to determine the amount of lines you can have

    http://www.erlang.com/calculator/lipb/

    use you upstream not down to calculate, i put in your number of 512 and did it at worst case, your maximum lines is 5, so then add web traffic and you are out of bounds.you really want to give your self some headroom, most internet service providers offer a poor upstream, thats why i mentioned verizon fios, lowest package is a 5mbps up/ 2mbps down ($35ish), when computing against yours it allows for 20 lines, so that gives you room for internet use and phone use.

    but then again this all depends on what the voip company is compressing at, I took the verizon voicewing test, this is my work internet and it told me I only had room for 2 lines, i’m at about the same speed as you.. link to the test:

    https://www22.verizon.com/ForYourHome/VOIP/BandwidthTester.aspx

    vonage should have one as well, you just need to find it on their site, or call the company you want to have service with and ask them what they recommend, can’t hurt :p

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