A user gets notified of voice mails via the Mobile Phone Notification Device and logs in to their voice mail from their cell phone directly through the notification call. But, now the user still gets notified and prompted for a username and password, but doesn't get authenticated. The same user can log into their voice mails from the IP phone, and dialing in from their cell phone remotely. They say this was working before but stopped working, supposedly, when a DN was removed from their IP phone.
What credentials are they getting prompted for, if not the same as when they log in from their IP phone?