If you have large number of DIDs on your PBXware system, and you want to get rid of them all, only way to do it is from within the database:

• SSH into your PBXware and run following commands

 cd /opt/pbxware
 sh/mysql
 use pbxware
 delete from dids;
 use admin_site
 delete from pbxware_phones;
 exit

After above is done, all of your DIDs will be deleted from the system.