Whom did we select to implement the service and why ?

SHORT ANSWER:
Operator P. Because he has partnered with builder to put his wired network at all 1600 communication points and was the only operator who was offering the on-Premise PBX solution. The tariff plan was similar or lesser than most other societies where an independent intercom solution is deployed without any riders on subscription rate by residents to other services like broadband, TV, or landline voice in order to subsidise intercom.


DETAILED ANSWER:
In APR condominiums among Operator A, B, J, P & S offering Broadband services, only operator A, J, and P can offer voice services with B & S being pure data (Broadband) players.

Operator A, J can do only Centrex. A is ready, but he competes with J for final 30 meters. J's network is not even ready now. 

Operator P can obly do On-Premise PBX which we prefer and Builder has tied to make Operator P network in each and every Home and reserved for exclusive use by Operator P for delivering services

The default choice therefore was only Operator P and the intercom contract is therefore given to Operator P as they submitted a bid which met both our competency and cost requirements. 

Most societies having independent intercom pay Rs. 100-150 per extension and therefore operator P's  of Rs. 1000 one-time and  Rs. 100 pm offer was acceptable. In some old societies where one operator has majority business, he offers intercom free to all as they already recovered CAPEX because of many years of near monopoly or full monopoly business. Its not possible on FTTx and Operator choice from day 1,  to replicate the zero cost model from start, but the door to make cost zero or Rs. 25 or Rs. 50 is open, once  everyone subscribes to intercom service for few years and vendor recovered his CAPEX and made reasonable profit.