10.1.2. Distributed Circuit Switching 
With OpenScape 4000, the circuit switching of the payload (B channels)
is not limited to the central switching network
- Calls within IP-based access points are switched to a local TDM switching network directly and, consequently, without runtime in the IP network. The switching network on the HG 3575 module has a capacity of 256 channels.
- Calls between different IP-based access points are switched in the IP network.
- Calls which go beyond IP-based access points are switched both in the IP network and in the central OpenScape 4000 system.