Names the TCP Redirect Group used for a subscriber's very first captive-portal redirect — their 'initial captivation' — before they've logged in at all. This is the first-touch redirect that actually produces the login page a brand-new subscriber sees, distinct from cssgCfgTcpRedirGrpForAdvCapt, which handles a separate, later redirect for advertising once already in the flow. A hotel Wi-Fi operator would configure cssgCfgTcpRedirGrpForInitialCapt to point at their branded splash/login page so a guest's first browser request is captured and shown that page before any internet access is granted.