Is this a Gen. 1238 (1700598G1) or a Gen. 2 1238 (1702598G1)? If it is a Gen. 1 you will need to use the upstream router to connect the two subnets together at layer 3, and we need more information about that router. If Gen. 2, you can do as follows:
Assign an unused IP from the data subnet to VLAN 160.
Enable IP routing with the "ip routing" command.
On the upstream data router, add the command: "ip route 192.168.0.0. 255.255.252.0 ip.of.vlan.160
(How many phones do you have? That's a big subnet.)
Optionally, if the phones must reach the Internet directly, add the command on the 1238:
ip route 0.0.0.0 0.0.0.0 ip.of.data.router
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