these are the sounds found in most native Lao dialects:
there are also sounds not on the chart

Other sounds:
a labio-velar central approximant /w/
aspirated counterparts of /p/, /t/, /k/
labialized versions of most consonants
palatalized trill /r/ in loan words
three diphthongs
six tones

(from: English Language Services, Inc. (corp.auth.) 1966. Intensive Spoken Laotian (Bk. 1). Washington, DC: English Language Services.
Morev, L. N., et al. 1979. The Lao Language. Moscow: Nauka)