Asterisk with SS7


I am working on a SS7 project, where we succesfully implemented 8 spans SS7 link using Asterisk 1.8, Dahdi 2.6.1 & chan SS7.
PRI cards used is Digium TE420 - 2 Nos.
Now we need to scale up the system to total 20 Spans. The server used is Intel XEON 16 core machine.
Can we scale up with same setup to 20 E1 for SS& signalling & media. Please advise