Consider an AD-1010.
Check it out here.
LinkyWe put one in our in-laws house. If they hit the button the dialer calls us several times at several places. It works, but does not have a dedicated staff to monitor. Our house phone, and our cell phones become the monitoring alarms when the button is pushed.
This what we bought - it works very well. Plug it into a UPS device to guard against power failures and your all set.
This might be an old model, but an equivelent is all you need.
> Items Ordered
> ======================================================================
> Quantity: 1
> Item Number: 01-2001
> Description: Emergency Voice / Pager Dialer w/ 2 way communication,
> Skylink AD1010
> Unit Price: $149.99 (On Sale)
> Total Price: $149.99
> ----------------------------------------------------------------------
> Quantity: 1
> Item Number: 01-2010
> Description: Panic Transmitter, Wireless, Skylink PT434
> Unit Price: $19.99 (On Sale)
> Total Price: $19.99
> ----------------------------------------------------------------------
> Quantity: 1
> Item Number: 01-2011
> Description: Wrist Watch Style Panic Remote, Wireless, Skylink HW434
> Unit Price: $19.99 (On Sale)
> Total Price: $19.99
> ----------------------------------------------------------------------
> Subtotal: $189.97
> Overnight Shipping: $55.00
> Grand Total: $244.97
>