NEC's IMS-based Femtocell system uses an IMS configured with a SIP server to independently control communications from Femtocells.
The system distributes transmission load across the entire mobile network, regardless of the traffic load, and helps prevent congestion as Femtocells spread and traffic increases.

The IMS framework is also compatible with backbone networks migrating to IP-based networks, and therefore facilitates the construction of all-IP networks for broadband, fixed and mobile communications.
As the system is also highly compatible with SDP (Service Delivery Platforms), new business is anticipated in the future from the linkage of Femtocells with home servers.