I've been deploying ASUS RT-N16 routers with Tomato on them for my end users. I sell these with Tomato pre-installed and pre-configured to prioritize traffic from Aastra and Obihai devices out of the box for $129.
The routers can be obtained for less than this at all the usual places; flashing Tomato is pretty straight forward.--
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Get your Obihai ATA in Canada.