I have a UC520 configuration as follows. PRI, Main number, (555-111-2222) is mapped to extension 222. This is a shared line appearance on all phones (7960). My problem is that the second call that comes in to that number rings busy, or voicemail, depending on how I set CFB. I would like it to ring on the phones. If possible I would like to do this strictly via CCA 2.1 or last resort CUE gui.
One way to do this in CCA 2.1 would be to create multiple shared directory numbers - 222, 223 and set the call-forward no-answer and call-forward busy target on 222 to 223. Also, you will need to make sure that both 222 and 223 are configured as overlays on IP Phones.