We have formed distribution deals with a couple of companies and have added additional lines to our account, not extensions but additional lines with their own auto receptionist/IVR Menus that are also connected to our extensions. Unfortunately there is no way to know which company the customer has contacted when they call our phones. Our only work around right now is to shut down caller id and instead have the number our customer called appear on the little screen on our desktop phones. If there was a way to add these numbers so a certain line blinked for each number, similar to how it works with extensions, it would make our lives that much simpler. For all the "features" listed on RingCentral, adding these lines and setting up the individual IVR menus is not easy in the slightest, but not being able to see who is calling and for which company is definitely disappointing being that this company boasts how customizable their service is. Making a change like this would be very helpful for many people I am sure.