Another 4.4.2 KitKat update now hitting Sprint Galaxy Note 3 (SM-N900P). The new 4.4.2 update comes in firmware build N900PVPUCNC5 of which according to the given changelog it includes the WiFi calling support. The N900PVPUCNC5 is the second 4.4.2 Kitkat that landed on Sprint Galaxy Note 3 next to the first released of 4.4.2 N900PVPUCNAB last month.
The N900PVPUCNC5 is now live via over-the-air with OTA update, WiFi connection. You can simply perform the manual method just head-over on Settings > General > System Update > Check for update. Your Galaxy Note 3 must not been rooted or modified for you to be able to download the NC5 update. Some reports that the N900PVPUCNC5 now equipped with a new booloader which prevents you from going back to the old software update versions. For those who might looking for the OTA flashable firmware NC5 can be found at XDA-thread.
Source: Sprint community support