'been liaison' is not a correct or usable phrase in written English.
To use liaison correctly in a sentence, you could say "I have acted as a liaison between two departments."
Henderson's task was liaison between the British delegation, the FO news department and the British embassy.
"We spend a lot of time talking to them; there is liaison at all levels," says one official.Serious criminals continue, however, to find refuge in Northern Cyprus.
But few people talked with Mr. Lay as much as Mr. Roberts, the Enron lawyer who is liaison to the creditor's committee.
From 1992 to 1993, General Hagee was liaison officer to the American special envoy to Somalia, Robert Oakley, working with the American military and the various Somali factions.
The second broad category was "liaison," information provided by cooperative foreign intelligence services from their own sources, whose credibility is often unknown.
"There are a record number of CAMHS beds and there will be liaison mental health services in every A&E by 2020.
One of Smith's duties was liaison with Major General Edwin "Pa" Watson, the Senior Military Aide to President Franklin D. Roosevelt.
Important and distinct components of the nursing role which have been defined are liaison, patient care coordinator, team member [ 28], and leader [ 24].
Employees sit by the phone at night to provide directions to games and postgame bar sites, and there are "liaisons" at each bar to keep the mood light.
The other was Liaisons Dangereuses, Typical Me ($225), a fascinating jumble of fruit scents, chunky and not light, virtually chameleonic once I sprayed it on my left wrist.
