I am trying to make a call using conversationAPI , /api/v2/conversations/calls: { "callFromQueueId": "", "phoneNumber": "", "callerId": "" }
And i use Oauth LoginImplicitGrant.
If you are using a webRTC phone, you should set the "place call with another app" (see Allow apps to place calls - Genesys Cloud Resource Center)
I also discovered that there is a new attribute sessionType with the value softphone when I am making an outbound call from the UI. This is pure reverse engineering, I don't find any description in the developer tools.