XXII
IntroduCtIon
migration and levers for optimization (e.g., remote migration)
should be carefully considered.
• Migration timeline: Migration of the full customer base should
always be accomplished in an ambitious timeframe to mini-
mize the periods with negative cash flow.
• Long-term savings: e main expected benefits of switching
off the PSTN platform are savings in energy costs, service
level agreements, and personnel costs in planning, assembling,
andmaintenance.
To support each country with this challenge, we have developed
a standardized business case framework. Besides overarching benefit
calculations this helps to
• Provide a solid and comparable basis to orchestrate CAPEX,
OPEX (operational expenditure), and revenue discussion
withi ...