Hi Munish,
Logical Partitioning feature has been developed for countries like India where Department of Telecommunications does not allow to mix internal IPT and PSTN call on two fifferent lines on same phone.
To aviod this Toll Fraud, Logical Patitioning has been introduced in Call Manager thereby restricting. On same line , u can have internal and PSTN calls thereby configuring LP/Geolocations policies.
Your deployment is a valid deployment since u are not violating any DOT regulations and Internal calls are within your Network.
regds,
aman