Velocity and IDA tag: IDA_ERROR_BEEP

Hello.

I used in a page the tag IDA_ERROR_BEEP, in this way:

<meta http-equiv="OnLoaded" content="ida:IDA_ERROR_BEEP">

The tag works, I can hear the usual dual beep where desired.

Yesterday we changed the server, moving to a Windows Server 2012, copied the exact content of the site, reinstalled Velocity and so on.

Everything works except the beep.

Is there something on the server to look for? Security issue?

Some infos: Motorola MC9190, Velocity version 11019, IIS7 (IIS6 on the previous system).

Thanks.

Matteo