I updated my iphone to version 9.2 and I no longer get calls on my other devices It doesn't ring through to my ipod touch, and attempting to call out says it is disabled on my iphone. When I go back to the settings for which devices to allow, and message forwarding, its all enabled and set to forward.
In the settings, updating to IOS 9 adds the new redundant setting "Calls on other devices" and turns that and WiFi calling back to "Off"

Settings -> Phone -> you will find Wi-Fi Calling and Calls on Other Devices to turn these features back on.