Escalation to send out email and notification

Hi

I have a problem with escalation service. I want escalation service to send notification email and notification onscreen,but escalation service only send out email when set use escalation service in Workflow & Escalation Configuration to "No", and vice versa, only send out notification onscreen when set use escalation service in Workflow & Escalation Configuration to "No".

Is there any solution to solve this.

Best Regards,

Natha