Routing Problem

I have two routers connected via a T1 line linking two networks. Traffic
between these two networks ( A and B ) is fine. I have a third network (
C ) connected via a VPN on network A.

I can ping C from A, but can't ping C from B. B has a static route that
says for network C go down T1 line.

Why does it seem as though Router A won't forward that traffic out its
ethernet port to hit the VPN router? By itself Router A works fine.

Router B (cisco):
ip route C subnet Serial 0

Router A (cisco )
ip route all subnet Firewall

Firewall is a Sonicwall
AJ