use kamailio; alter table acc modify from_tag varchar(128) NOT NULL DEFAULT '', modify to_tag varchar(128) NOT NULL DEFAULT ''; alter table acc_backup modify from_tag varchar(128) NOT NULL DEFAULT '', modify to_tag varchar(128) NOT NULL DEFAULT ''; alter table acc_trash modify from_tag varchar(128) NOT NULL DEFAULT '', modify to_tag varchar(128) NOT NULL DEFAULT ''; alter table active_watchers modify from_tag varchar(128) NOT NULL, modify to_tag varchar(128) NOT NULL; alter table pua modify from_tag varchar(128) NOT NULL, modify to_tag varchar(128) NOT NULL; alter table rls_watchers modify from_tag varchar(128) NOT NULL, modify to_tag varchar(128) NOT NULL; alter table sca_subscriptions modify from_tag varchar(128) NOT NULL, modify to_tag varchar(128) NOT NULL;