This one has me stumped. I have attached a jpg to show what is going on. Basically, EIGRP 20 redistributes the default route to the switches. However, the switches are picking on the FE interface of our VOIP gateway. It should be picking up the GI0/0 interface of the router. This is causing an extra hop and can't determine why this is happening.
I do not have enough of the details to fully explain what is happening. But I think that I see part of it. EIGRP 20 is advertising the route over both VLAN 60 and VLAN 70. The voice gateway appears to participate in EIGRP on both VLANs and has chosen as its default route the path through VLAN 70. This implies that the advertisement on VLAN 70 has a more attractive metric than the path on VLAN 60. And since the preferred route on the voice gateway was learned on VLAN 70 it then advertises it out VLAN 60 and with a metric that is probably still more attractive. You could probably confirm this with the output of show ip eigrp topology for the 0.0.0.0 route from both routers.
Based on what I think I understand about the issue I would suggest that you could configure an outbound offset list on the WAN router on the Gig0/1 interface to boost the metric of the default route and make it less attractive than what is advertised out Gig0/0.