<https://www.cspsprotocol.com/slg-and-slh-interface/#webpage>
<http://schema.org/description>
"SLG and SLh interfaces are for location services from the GMLC. E SMLC is the node with MME for the location estimate of a UE."
<https://www.cspsprotocol.com/slg-and-slh-interface/>