I'm not sure what version the BCM 400 is but has anyone had several IP phones,at the same time, lose internal d/t, therefore not being able to make any calls? I've been able to fix the problem by disableing/re-enabling each ext. Have had to do this twice in the last 2-3 months. Seems like the same ext. numbers each time. any suggestions? Could not find a patch on the Nortel site for this particular problem. Thanx.