Can’t imagine this has anything to do with the trunk provider. Check out this bug report, including the comments and see if it matches your situation:
http://issues.freepbx.org/browse/FREEPBX-10713
Can’t imagine this has anything to do with the trunk provider. Check out this bug report, including the comments and see if it matches your situation:
http://issues.freepbx.org/browse/FREEPBX-10713