Conditional monitoring, Downed Device Detection

[nicolapiazzi]

Hi,
Cacti is very useful to send an alert when a device is detected as down,
For example it can send a message when tre router in a remote office is unreacheble.
But in that office there are other devices that I need to monitor, if I use the same method i' ll receve an alert for each device monitored also when router go down.
Is possible in some way to put a condition in a device thet alert will be sent only if the depending router is active ?

Thanks
Nicola