I have it set so that a particular extension rings 3 times before forwarding to another extension (if call is unanswered). On this secondary extension, I want it to ring up to 6 times before the call, if unanswered, goes to the original extension's/user's voicemail. If the call is from an external source, it only rings TWICE before going to voicemail (though, if the call is internal, it works as desired). How can I set it so that external calls behave the same as internal calls (the forward to the second extension rings up to 6 times before going to voicemail)? Thanks!

Lands Phones - NorStar - Startalk Flash 2 Phone