[Asterisk-Users] T1 Failover switch?

[Chris A. Icide]

Somewhere in the last 4-5 moths someone on this list posted something about 
a 'failover' switch for T1's.  Basically, a box that would receive the T1 
from the network provider and have the ability to output that T1 to a 
primary device and when that primary device goes into alarm, immediately 
switch over to a secondary device.  I even believe they may have posted a 
link to a site that sells the things.  However, I've not been able to 
google the right keywords to force the post to pop up in a search.  So if 
there is anyone out there who can point me in the right direction (towards 
one or more of these devices), I would greatly appreciate it.

-Chris