I would like to know how much physical interfaces i may to include on MLPPP configuration using the Cisco 2821 with VWIC2-2MFT-T1/E1
You can have a maximum of 16 links in a bundle, doesn't matter what is physical interface type. For high density now there is a new NM with 8 T1/E1, for example. or the hwic-ce1/t1-pri that is made specifically for data and a bit cheaper than the vwic2.
Hope this helps, please rate post if it does!