I am working with a UC 520 that has started to show signs of possession.
The AA menu allows numbers one to three to call three extensions that forward to voicemail on busy or noan. Menu item 4 allows transfer to the prompt management system. All works as advertised on local phones attached to the UC520. Until two days ago, calls from the PSTN FXO lines also transferred correctly. Now, however, pressing number 1-3 from an outside line results in the calls bouncing back out and initiating another external call back to the AA. Oddly enough, though, pressing 4 transfers the caller to the prompt management system as it should. It's not a DTMF decode issue as far as I can tell, since the prompt management system recognizes the extension and PIN and works correctly. No changes were made to the UC520 config as shown by the logs and configuration date. I have checked the bug tool, but there is no mention of any sort of call routing mystery that is remotely similar. I am hoping that someone out there has read about or experienced some sort of parallel issue and might be able to save me several hours of poring over debug files onsite, since the box is not configured for remote admin. My first trick will be a reboot when I arrrive onsite tomorrow.