If there are no further comments, I will merge the pull request today (late afternoon). Just a note about "handling more than one `Geolocation` header": The LoST module creates a list of `Geolocation` headers (be it multiple values in a header or single headers) and can decide which header type to use to retrieve the location for a LoST request based on certain module parameters. This is done via module functions and does not require any additional steps in `kamailio.cfg`. The new module function `lost_held_dereference` can be used when Kamailio is configured as PSAP endpoint, but was intended more for testing purposes. To get the correct `Geolocation` header value (URL) for this function some additional steps in `kamailio.cfg` are required.