No conference-calling for third-party custom Android dialer/caller apps?

[AtTheSpouterInn]

Am interested in developing a customer dialer/in-call app to replace the native one, but have read unofficially that certain related apis, such as for conference-calling, are not exposed and their functionality is therefore off-limits to third-party developers. Is that true?

 

[Dannydet]

Nope.
Youmail has conference calling

 

[AtTheSpouterInn]

Ah, okay. Thanks.