I have a system setup on AWS/EC2, it currently is using their CloudWatch alert system. The problem is this sends just to email, when ideally I would like this to be making a phone call and/or sending text messages to certain phone numbers when an alert fires (Note that I do not need the phone call to actually say anything, just call the person).

We are trying to solve the problem that Amazon alerts are only useful if people are checking their email, which isnt always the case because all server problems love to happen at 4am on saturday...

Please respond with any possible solutions/ideas, ideally I do not want to implement an entire monitoring system (IE: Nagios) on top of everything to handle this.