I asked the rep if I could use my ST-516 and she even placed me on hold while she consulted Tech Support and when she came back she assured me that it would not work
Curiously, I've been told the exact same thing by multiple Telus reps. Keep in mind I've only ever had 15Mbit service, and the ST516 is one I received directly from Telus. Next time I call in I'm just going to lie and say I have a Zyxel.