We have been using 120% of our T1 connection according to the ISP. What hardware/WIC card upgrade is required to for bandwidth of 3 Mbs? We currently have a 2621 router.
You can add another T1 WIC (adding another T1 line) and bond the 2 T1 interfaces together using the "multi-link interface" (approx. 3Mbs)
May be worth turning on Netflow for traffic analysis. Make sure you're not paying for scavenger traffic!