7.2. Guidelines for Installing an IP Feature 
- Diagram of the customer IP network
- Create an OpenScape 4000 network plan with all gateways, access points, HFA terminals
- Define the number of LEGKs and HG 3500 gateways required
- Map the OpenScape 4000 network plan to the customer IP network
- Perform network analysis with the help of the IP service tool to determine the network’s VoIP capability.
- Confirm the feasibility of the IP components planned