Decides whether subscribers who land in a service via Auto-Domain get a NAT address assigned by that service rather than keeping their original address. With this enabled, an auto-domain subscriber effectively borrows an IP from the target service's own pool (useful when the service network can't route the subscriber's original address), while disabling it means the subscriber keeps the address they already had. If the 'corporate.apn' auto-domain service uses private addressing that overlaps with a mobile subscriber's original PDP address, an operator would set cssgCfgAutoDomainNatEnabled to true so SSG NATs the subscriber into a non-conflicting address inside that service.