Use case when the call contains two Geolocation headers.

Example

Geolocation: <http://example.org/held-link>
Geolocation: <cid:7607331117@10.3.90.20>

Technically such a call contains Geolocacation by_value and does not require deference first Geolocation header by_reference.

From my point of view.
When used emergencyRouting routing need to prefer Geolocation by_value. This alow delivered call with minimal delays but maybe with low accuracy.
When used emergencyDispatch routing needs to prefer Geolocation by_reference. This alow send HELD request to a mobile carrier and get latest mobile device location.

Technically on Kamailio maybe used emergencyRouting and on PSAP used emergencyDispatch.

So as idea, in lost request check the number of present Geolocation headers, if present more than one header:

1. and used emergencyRouting then try search by_value Geolocation;
2. and used emergencyDispatch then try to search and dereference by_reference Geolocation.

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