Question: Android / Apple phones offer a service calledWiFi calling which enables a user to make calls, send and receive text messages over WiFi network, when

Android/Apple phones offer a service calledWiFi calling which enables a user to
make calls, send and receive text messages over WiFi network, when available,
rather than relying on a telecom operator. Using an space-time diagram explain
how a WiFi access network, an IP network and a telecommunication network
interact to enable WiFi calling.

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