We have several PBX customers here in Michigan that are reporting call disconnect issues. Most have AT&T Flex IP service (don't get me started) demarc'd to us as a PRI. These services have been in for a couple years and, in the last 2 weeks, have seen on-going problems with calls disconnecting in the middle of a conversation. AT&T says they don't have a problem - "It's your pbx". We have changed nothing! Anyone else seeing issues lately? Thx.