[arnauds]

I found it...

In Registry Editor, navigate to the following registry key branch:

For Voice Mail:
HKEY_CURRENT_USER\ControlPanel\Notifications\{A877 D661-239C-47a7-9304-0D347F580408}

For New Text Messages:
HKEY_CURRENT_USER\ControlPanel\Notifications\{A877 D65B-239C-47a7-9304-0D347F580408}

For Missed Calls:
HKEY_CURRENT_USER\ControlPanel\Notifications\{A877 D660-239C-47a7-9304-0D347F580408}

Once found the correct registry sub-key that represents the event that you want to enable the “Repeat” option, edit the value data for Options value name. Change the value to 1073741835 (in Decimal base) or 4000000B (in Hexadecimal HEX base format). Save and exit from registry editor.