Dude, Voice vlan is special feature. Voice Vlan. Whenever a phone is connected to the switch port,switch exchange information with phone with vlan address and TFTP address.then switch guides the phone with vlan path,gateway and tftp address. In your first configuration,you are using voice vlan command and information will be exchanged. you can connect both phone and host,both will work. Another thing,because of voice vlan command,host will be getting data vlan ip and phone will be getting Voice vlan Ip In your second config,your staticly assigining vlan,it will work like regular vlan and phone cannot communicate to tftp server and call manager.
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