System installed with latest software and firmware in both. I have also replaced both units. Line 1,3 ringand 2,4 are respective rollover lines that go to vmail with no ring. The have a master message and 2 mailboxes from a custom service menu. Once a week roughly line 1
is locked up and if you pickup l1 as a conference you can hear the vmail and the custom service greeting playing. I have changed the cpc monitored the line and cant find anything. The incoming are pots and the dsl is piggybacked on
L 5 not on the system. ATT says not a fault of their lines. Sorry for such a long first post. Any insight would be great.