escalation process using Nagios core

[MichaelJean]

I want to ask if I want to use escalation process using Nagios core

I have my cfg file like this



define service {
host_name Test
service_description Check SSH
check_command check_ssh
max_check_attempts 2
check_interval 2
retry_interval 2
check_period 24x7
check_freshness 1
notification_interval 20
notification_period 24x7
notifications_enabled 1
register 1
notification_options w,u,c,r,f,s
contact_groups Test
}

define serviceescalation{
host_name Test
service_description Check SSH
first_notification 3
last_notification 5
notification_interval 20
contact_groups Test
}
My question is can anyone correct me if I'm wrong that mean every 20 minutes I will receive a notification ? and I can't understand the number 3 and 5 in define serviceescalation ?

another question what if after 5 notifications I Want the problem to be reported to the operation team for example ? how could I configure this ?

The last question why when I receive an e-mail using echatspin echatrandom the escaliation