Automated Voice Calls from Zabbix to Cell Phone at 3am?

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http://serverfault.com – Is there a way to have Zabbix place a call to a given user's cell phone in case of high priority issues that happen at 3am? My original plan was to use Asterisk and Festival as part of a Zabbix alert script, but it has proved to be to complex for me... Does anyone know of an easier way? (HowTos)