I have a customer who has a UC520 with CP-524G IP phones. Right now I am using CCA 2.2.1 to administer the system, although when I originally installed the UC520, I used CCA 2.0.
After the initial UC520 installation, the CP-524G phones would be able to receive two calls on the same extension, i.e. dual-line. Recently, one user had me change his extension's call forward busy from "none" to "Voice mail", so that instead of the second call ringing to his phone, it would go to his voicemail. After a while, he decided he wanted to go back to having the dual-line again, where if he is on his extension and another call come in, it will be like call waiting, and he can answer the second call or not. So, I switched his CFB back to "none" which is where it had been originally, but now if he's on his extension and a second caller tries to call that extension, the caller just gets a busy signal. I can't seem to figure out how to get it back to where call waiting is enabled and he can answer the second call. Right now, he doesn't get any kind of indication that a second call is coming in, and the second caller just gets an immediate busy signal.
Thanks for your assistance.