IETF RFC 7840 PDF

For cases where location servers have access to emergency routing information, they are able to return routing information with the location information if the location request includes a request for the desired routing information. This document specifies an extension to the HTTP-Enabled Location Delivery (HELD) protocol that updates RFC 5985 to support this function. Allowing location and routing information to be acquired in a single request response exchange updates RFC 6881, as current location acquisition and route determination procedures are separate operations.