MLPPP

We currently have a T1 line connecting to a Mikrotik router via a Cyclades card. The router is
using OS version 2.8.28, level 4. We are upgrading the T1 line to a faster circuit an MS1 connection, which is I think just 4 T1 lines. AT&T is telling us we will need to provide 4 T1 WIC cards bonded together via MLPPP. Does Mikrotik support any cards that will do this with our current OS version 2.8.28? I currently have a two port Cyclades card in the router, but am only using one port for our single T1 connection. I also have a single port Cyclades card as a spare. Is there any documentation on how to do this with our OS. Any help would be greatly appreciated and lower my stress level significantly! Let me know if you need additional information.