I need to add 3 T1 lines from my main office to 3 new branches. I would like to use my existing 2621 if that is possible. I found an N-module that may fill the bill. It is the Multiport T1/E1 IMA network module. Does anyone think this would work in the capacity I need it to? These T1 ones will be full channel, 1.544 Mb/s lines and that's all. Basic framing and encoding. Our routing protocol is OSPF, but I may change it to RIP 2. Thanks!