There is a problem with the 6.1 s/w with PRI set as NI2 protocol, Nortel issued an MR(maintenance release) to correct that problem with 6.1 s/w it has the updated protocol table entries for the NI2 current international standards. So I will suggest check your s/w if it’s not the new updated s/w Check system version it should end up with G05 not E06,If it’s the old s/w you should replace it and it will correct the problem. I hope that helps.