We have Cisco SPA514g phones and some of our folks need to answer calls differently depending on what DID is called. I've created a ring group for the DID and set up dummy extensions for each user and put them in the group. I then manually configured those dummy extensions on line key 4 on the phones, and it works well enough. I'm wondering if, instead of creating a dummy extension for each user, I can create one shared dummy extension, configure it to accept multiple calls, and configure just that one on line key 4 (set to shared appearance) on multiple phones. What happens when multiple phones have this one extension, and multiple calls come in, or a user is on a call on that extension. Would a second call still ring at the same extension on other phones, or would it show as busy?