Add their mobile/cells to EC500, then put them in a coverage-answer group (there is a limit of (8)), then add a speed dial on the phones.
The end user presses the speed-dial (autodial or abrv-dial) button, and it rings all the mobiles at once.
Keep in mind, it also ties up your Trunking. So (8) is probably a good number to start with.
Thanks,
98C
We are what we repeatedly do. Excellence, then, is not an act but a habit. ARISTOTLE 384-322 B.C.