You would need to do a traceroute to see... the way sprint has the system setup they can route you with their traffic, route you back to your company then out, route you on your own virtual lan (no internet) or route you a specific path... it all comes down to what arrangement the mvno/customer has with sprint.
The AAA username/password combo just authenticates with the system, it then will setup the connection as mandated by the AAA profile for that user.
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