Our customer has a UC520 with a SIP trunk and 3x isdn 2e Bri lines.
For some reason they can only use 1 of the ISDN 2e lines meaning they can only ever make/recieve 2 calls via the isdn
I suspect its something to do with the dial-peers but i cant spot anything, is any one able to double check the attached config?
ISDN calls go straight out
dialing 9 first uses the SIP trunk