A friendly reminder, there is system bug from Alcatel voice mail system (Alcatel-Lucent 4635), the date and time stamp of voice mail become incorrect after 24/11/2015.
They confirmed the bug fix only apply to supported model for VMS, NOT to old version.
I spoke with PCCW, they mentioned most of the AP locations are using this version VMS, so pls also contact your local provider to check if your VMS potentially affected and if any alternative solutions.
I also attach the Impact list for you as reference.
Should you have any questions, feel free to let me know, thanks.