Hello Erik,
a Cisco 7206VXR with 3 8T1 PAs can do the job.
it is a question of port density.
if an ADM/RED can be involved in the picture you may look for a channelized T3 network module to use on C3845
(if it exists)
another possibility if there is a WAN provider in the middle is to use an ATM T3 and to use FR -ATM service interworking with FR used on remote sites.
Hope to help
Giuseppe