There's usually no need for a separate QOS unit such as the DI-102. There are VoIP units with QOS built in. I have used QOS in the Linksys SPA2100 and SPA2102 with good results. The QOS in those Linksys units is for outbound traffic only. I did not need QOS for inbound traffic because the download speed of my broadband connection is high. If you need QOS for inbound traffic as well then you should look for a different solution. Some people have reported good QOS performance using a DD-WRT router.
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