(config)# radius-server vsa send authentication

This command enables sending of the following information:
    Cisco-AVPair = "ssid=eduroam"
    WISPr-Location-Name = "Location Unspecified "
    WISPr-Location-ID = "isocc=IT,cc=39,ac=32 ,network=eduroam"

The same also works for accounting:
  (config)# radius-server vsa send accounting

Tested on Aironet 1142