From 2023 onwards, the volume of fixed line outbound voice calls in Japan is forecasted to exhibit a slight year-on-year decline. This decreasing trend begins with a base value of 178 minutes in 2024 and stabilizes at 174 minutes by 2028. With each passing year, a consistent annual decrease of approximately 0.56% is observed. This steady decline, representing a negative compound annual growth rate (CAGR) of 0.56% over the five-year period, signifies a gradual reduction in usage.

Future trends to watch for:

Continued shift towards mobile and internet-based communication solutions.
Potential technological advancements in fixed-line services that could affect usage patterns.
Sociodemographic changes, particularly among the aging population, that may impact fixed-line call demand.