Ahh thank you for the clarification. Its going to be one or the other in this case. There is not a way to have it both trigger an alarm siren at the panel AND not receive a call or send signal to monitoring station.
Group 25, Trigger alert at panel, trigger notification but no Alarm, and no call from operator.
-or-
Group 38, trigger Alarm, trigger notification, send signal to monitoring station and be called.
If the Group 38 sensor sends a signal to the monitoring station, operators will call to notify.
Monitoring procedures can be found here