Today we’re going to configure a Linksys Router for VoIP QoS. Most modern routers offer some sort of this feature. I just picked Linksys because it is so common. First, let’s explain what it is and what it does. So,what is QoS? It stands for Quality of Service and it is a way of prioritizing network traffic by what is deemed as most important. Obviously, this is what we want in any mixed network that has voice applications. It works by giving preference to traffic deemed most important. It can do this in a number of ways . (See screenshot below)
QoS as found on any consumer router running on a standard Internet Service Provider will ONLY work on upstream/outbound data (data going from you to your ISP). You cannot realistically control the priority of data coming TO you FROM your ISP, since you can only control the data on your side of the modem.
It is true that slowing down the download of data will slow the acknowledgments of that data in a TCP/IP connection, and will therefore slow down (eventually) the transmission of data from the remote. However, this is not a function of QoS. This is a function of TCP/IP. And it will not solve contentions between VoIP and other data, since VoIP data still doesn’t get priority. You CAN help this out by limiting your bandwidth to downloading applications if theiy support it, but this is throttling and not setting priorities.
So, QoS can help a bit and may be worth the effort if you think your network is causing problems with your VoIP.
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Can you recommend something simillar to a bigger office such as 50 users or so ?