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I am making a centralized system for call control - whereby my app can tell a user's phone to make a call (pretty standard stuff on other platforms)

I am still using the dev sandbox so maybe that is part of the limitation - but anyway here goes with the issue

If I have authenticated my server app as say 'extension 101', when there is a call on 'extension 102' I can control it fine. I can hold / unhold / hangup etc.

But if I tell 102 to make a call ( regardless of what number I tell it to call ) I am getting the following as part of the response. What I want to check is whether
a) I need to get elevated permissions for my 'extension 101' - not sure how to do that in sandbox

or

b) the error code is somewhat generic but in fact there is no way to do this

Content: {

"errorCode" : "CMN-419",

"message" : "In order to call this API endpoint for another extension, user needs to have [InternationalCalls] permission granted with extended scope",

"errors" : [ {

"errorCode" : "CMN-419",

"message" : "In order to call this API endpoint for another extension, user needs to have [InternationalCalls] permission granted with extended scope",

"permissionsName" : "InternationalCalls"

} ],

"permissionsName" : "InternationalCalls"

}