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,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 :)