During the WWDC 2022 keynote, Apple announced that users will be able to initiate, hang up, or mute VoIP calls in supported Apple Watch apps such as Webex. As part of a watchOS 9 software update, that means Apple is expanding VoIP calling on the Apple Watch beyond FaceTime audio calls.
MacRumors pointed out: With Apple extending the CallKit framework to watchOS 9, the feature will allow users to answer VoIP calls directly from the Apple Watch on the wrist.
Previously, Apple Watch users have been able to experience FaceTime audio calls over Wi-Fi networks through the dial-up app. And the expanded support for VoIP calls in watchOS 9 will bring more options.
Unfortunately, Apple has yet to disclose more details related to the feature. It remains to be seen how enthusiastic the mainstream VoIP calling app developers on the market will be with this CallKit improvement over the next few months.
Finally, watchOS 9 is currently available as a beta preview to developers. If all goes well, the official version will be pushed to all users this fall (probably September).