I guess you have google but lets try: https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-small-business-200-series-smart-switches/smb99-voice-vlan-configuration-on-the-200-300-series-managed-switc.html https://www.cisco.com/c/dam/en/us/td/...

Switchport mode voice Vlan 20?  I have not been around those switches, so sorry i could not help more. But with the catalyst ones you set Voice Vlan and another Vlan like: Switchport Access Vlan 10Switchrport Voice Vlan 20 Then have a DHCP (or static...

Hi, Just had a quick look at you config file in packet tracer. You need to trunk the Vlan's to each core switch.  Please rate answer if it helps  

Hi, Nice setup. Can you provide with some config text?  

Hi,To help you, it would be easier with some config example. Have you created a VLAN, dhcp or static ip? Is the fa port open at the router etc.  Please provide a config 