Liaison officer

A liaison officer was usually a spokesperson who represented the interests of his or her government.

Kira Nerys was the Bajoran liaison officer on board the space station Deep Space 9 since 2369, representing the Bajoran Provisional Government and the Bajoran Militia when the Federation helped rebuild it. (Star Trek: Deep Space Nine)

One job of the liaison officer aboard DS9 was to compile the material subsistence report, a job that Commander Sisko had to do when Kira was unable to assist him. 

Julian Bashir acted as a liaison when the Federation ambassadors Taxco, Lojal, Vadosia, and Lwaxana Troi visited Deep Space 9 later in that year. 

Li Nalas was Deep Space 9's liaison officer for a brief period in early 2370. It was shortly after his return from prison on Cardassia IV. 

A Cardassian liaison officer kept in close contact with Starfleet Admiral Kennelly during the crisis involving the Bajoran resistance leader Orta and his alleged attack on Solarion IV. 

T'Rul served as a Romulan liaison officer assigned to supervise the operation of a cloaking device loaned to the Federation and installed on the USS Defiant (2370) in 2371.