1. Login to your switch.
  2. After login type: <switch># config
  3. You will enter the config mode, type: <switch>(config)# show vlans to show the VLAN configuration.
  4. To enable voice s on the VLAN type: <switch>(config)# vlan <ID#> voice
  5. Check if the setting applied successfully by typing: <switch>(config)# show vlans again. The Jumbo column for the specific VLAN in the output should change toYes.
  6. Save your changes:<switch>(config)# write memory
  7. Logout from the switch.

Tested on a HP ProCurve 2900-24G switch.