Monitoring non-GRE tunnel VPNs

I have spent the last week trying to figure if it is possible to  
monitor non-GRE tunnel vpns with SNMP or any type of network  
monitoring package.  Here is the scenario that I currently I have one  
Cisco Router at my location that I have several external Vendors  
connect to.  Some of these vendors I care if the tunnel is up and  
others I do not.  I don't always know or have control of what device  
my vendors use to connect to my router.  The only things I can  
completely control is my router and the configuration on it.  I don't  
have the option of using GRE tunnels with all of my vendors so I  
cannot specify an interface with them.  I have tried using Cisco's  
MIBs and while they will tell me if a tunnel goes up or down, they  
can't tell me which tunnel has gone up or down.

My ideal would solution would be the notification of tunnel A going  
up or down, while not getting any notifications on tunnel B.  I have  
spoke to Cisco and done some searches on the web and have not found  
anything that would help.  Please if anyone has any ideas I would be  
interested to hear them.

TIA

Joseph Jenkins