I have a SB7.36 128 with a N12 card to NY Verizon providing the T1 only issues I had was verizion and the Bell in NY couldn't keep the pipe up so we were seeing the same errors. FYI the last verision of SB7 is 7.42 there were problem corrections as well as feature changes thru the 7's. Telrad did a no cost upgrade to all users (thru the dealers of corse) with 7.20 to bring them to 7.36 which fixed several bugs. But that freebe was atleast 3 or 4 years ago. 7.42 chipsets are available just shipped out a set last month.