Wow....

Well, as was discussed earlier, in the elevator industry we typically use a dedicated landline for emergency phone service. Not that your desire to accomplish this task out of the norm, but I believe it is, you will have to be the decision maker on which is the better of the two. As you read up on them, did they both claim to accomplish the same thing? Same features such as "stand by battery back up power sources" and their discharge rates? I suggest buy both (or just the Rath if you already own the Teleguard), then after rigorous testing, let us know which is better.

As far as pricing? I also suggest you contact Rath by phone or email and simply ask them the cost.