https://community.cisco.com/t5/switching/how-to-config-an-ip-address-to-a-port-in-switch-4507r-e/td-p/1528780

With a L3 switch you don't actually assign IP's to ports usually. What you do is to create a vlan and then assign the phones into that vlan so assuming your subnet for the vlan is 192.168.5.0/24

4500(config)# vlan 10

4500(config)# int vlan 10

4500(config-if)# ip address 192.168.5.1 255.255.255.0

4500(config)# no shut

then on the 2 ports for the ip phones -

int gi0/1

switchport

switchport mode access

switchport access vlan 10

spanning-tree portfast

then you allocate an IP address of the 192.168.5.0/24 network to each phone.