On Prognosis VoIP Monitor you "cannot" customize the alerts.
PROGNOSIS IP Telephony Manager -- an enterprise version of PROGNOSIS VoIP Monitor provides monitoring of a large number of phones and includes additional features such as multi-vendor support, highly customizable interface and advanced reporting capabilities. I would recommend you try that out. For more information about PROGNOSIS IP Telephony Manager, please visit
www.prognosis.com/iptelephony or please send a query via the contact us link at the top of this page and some-one witll get in touch with you.
Thanks
Raj