Newbie - FortiWIFI 50e Replacing Adtrans

I am replacing a vendor for our point to point setup between 4 locations.  They use Adtran for voice and data.  There are a few vlans setup and I do have a running config for each unit.  I can't keep the adtrans as I don't own that equipment.

I have new 50e units I am going to use with Comcast ENS service.  I am told through Comcast that the ENS is completely pass through.  My thought is to copy the settings over to the 50e units as-is and test as much as possible with a pc on both ends connected directly to the Comcast switches.  I can only test data this way, but I am thinking if the data works and I have the voice vlan mimicked, then I should be good on voice.

Any suggestions or am I off base here?

Thanks!

Dan