How to programmatically start conference call on iPhone

What are the ways to programma开发者_StackOverflow社区tically start a conference call on iPhone?

any knowledge about this issue?

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The only way I know of telling the iPhone to call someone is calling a "tel:0123456" url, the URL scheme for that is documented in the Apple SDK.

Source: https://developer.apple.com/library/archive/featuredarticles/iPhoneURLScheme_Reference/PhoneLinks/PhoneLinks.html

If it is possible it is not documented, but I think not that it's possible.