Hi. Im looking at installing a UC520-8U-2BRI-K9 for a customer as their previous support company have made a hash of installing some cheapy system.

They have 3 ISDN2 units on the wall, which will give 6 ISDN channels yes?

Ok. My trusty UC520 will have 2 BRI's on the front of it. Can I get an extra BRI interface card to slot into the machine somewhere so it can deal with the extra 2 BRI channels?