A friend of mine, an experienced tech, is new to supporting a NEAX 2000 IPS. Recently the PRI started dropping calls. CenturyLink claims they have checked end to end and not seen any problems, and the IPS isn't showing any alarms.

He's considering trying to change out the T1 card, but wanted to make sure the replacement was compatible. The original card is a PN-24PRTA. The replacement is the same part number, but wondering if there are certain revision level limitations.

Also, I'm looking for any insight to the problem with the drops that started "out of the blue" with "no changes" leading up to them.

Thanks!

Justin