I was looking on the web and basically the UC520 FAQ and Datasheet agree that the only VWIC supported for Telephony purposes is the VWIC2-XMFT-T1/E1, but there's nothing about the old VWICs.
Unfortunately I don't have the all the equipment to test it out myself :(, so I'm wondering if someone has tried this hardware combination with success.
Thanks in advance.
I would like to help, but I don't have the lab equipment. I'm not with the UC500 team :(, but if you are a partner and have a SBCS or Advanced UC specialization you can open a case online with the PDI Help Desk SBCS team at: