sprintf(sql,"select * from channels left join calls on "
"channels.uuid=calls.caller_uuid where channels.hostname='%s' channels.uuid not in (select callee_uuid from calls where hostname='%s') order by created_epoch",hostname,hostname);
"channels.uuid=calls.caller_uuid where channels.hostname='%s' and channels.uuid not in (select callee_uuid from calls where hostname='%s') order by created_epoch",hostname,hostname);