I can't remember when I posted this but I implemented a feature for advanced users to do this. In the "~/.dialcentral/settings.ini" file under the "[alarm]" section is a "notifier = " field. You can set that to a custom app that will be ran every N minutes. I provide a custom notifier as an example in "/usr/lib/dialcentral/example_custom_notifier.py". From my testing it appears to run. It includes the gv_notifier sound code but it is there for example purposes only, I have not tested it.