Hi. These becomes from layer 1 issue and could becomes from a wide of possibilities (telco or Asterisk PRI card). At first check cables an connectors, on Asterisk could make a loopback and check if problem persist. On telco should check cable of DSL Modem or whatever provide PRI service.
Mc GRATH Ricardo -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- Join the Asterisk Community at the 13th AstriCon, September 27-29, 2016 http://www.asterisk.org/community/astricon-user-conference New to Asterisk? Start here: https://wiki.asterisk.org/wiki/display/AST/Getting+Started asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
