sentences:  It insulates the application server farm from the network below via a programmable network abstraction engine, thereby providing the application specific call-control functions independent of each network.The ASC incorporates a number of open standard APIs, plus the signaling, media, and the feature inter-working between disparate networks that converged and consolidated applications require.It is scalable to support tens of millions of subscribers via a single system or via clustering and provides the necessary calls per second / transactions per second required for large-scale multi-network environments.