I am implementing MPLS and then Cisco Unity for VOIP. We have 8 locations with a Cisco 2851 where the servers for Unity will reside. What series router should I be looking at for our other locations? Currently we have 1751s that will need to updated for MPLS and VOIP. I have heard conflicting messages that an 1841 will work and that it won't work. What will be the router that will work best for MPLS and VOIP?
The 18xx doesn't support voice cards so for these you would need a 2801 or better.
Beside that, it will do fine.
Hope this helps, please rate post if it does!