same voice vlans differents subnets routing cisco L3 4500

Hi,

I've been looking for a while how i can have differents subnets in the same voice vlan and allow hosts on differents subnets see each other :

ex:

- how get host on subnet 10.85.1.128/25 can see Call Manager on

- how get host on subnet 10.85.2.128/25 can see Call Manager on

thanks

joseph