Softphones will not get a Voice VLAN as it runs on the PC and uses the PC's NIC card for communication. As best practice you can trust the sofphone in your QoS configuration, refer to the QoS SRND
The softphone (and IP Communicator) are using your PC's IP address. You can not give them another IP address. For the IP Communicator you have to add the MAC address of your PC's NIC card.
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