Hello Harlan,
when you will add a specific WAN link for the VoIP traffic you will need to have two separate vlans for voice and data: this will help you using for example PBR to perform source based routing.
I don't know if you can do it with the GUI I use the CLI.
However, the logical steps are the following:
on the switch:
you need to create the L2 Vlans for voice and data.
vlan 10
vlan 20
let's suppose the first is for data the second is for voice
on each switch port
interface fasx/y
switchport
switchport mode access
switchport access vlan 10
switchport voice vlan 20
b) DHCP
if the C3650 POE is also performing the role of DHCP server you should do the following
!
ip dhcp pool DATI
network 10.110.224.128 255.255.255.240
default-router 10.110.224.129
dns-server 10.98.112.32 10.55.0.32
netbios-name-server 10.52.64.37 10.24.128.151
lease 0 1
!
ip dhcp pool VOICE
network 10.110.224.144 255.255.255.248
default-router 10.110.224.145
dns-server 10.98.112.32 10.55.0.32
netbios-name-server 10.52.64.37 10.24.128.151
option 150 ip 10.98.67.5 10.55.61.4
lease 0 1
!
option 150 is used to provide the ip addresses of the TFTP servers to the phone
you may need to exclude switch ip addresses
ip dhcp excluded-address 10.110.224.129 10.110.224.132
ip dhcp excluded-address 10.110.224.145
you need to define the L3 interfaces associated to the two vlans
int vlan 10
description VLAN DATA
ip address 10.110.224.129 255.255.255.240
no shut
int vlan 20
description VLAN VOICE
ip address 10.110.224.145 255.255.255.248
no shut
Hope to help
Giuseppe