| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
| Brunei Darussalam | December 15, 1995 | Ratification: June 5, 1999 | | |
| Cambodia | | Accession: April 30, 1999 | | |
| Indonesia | December 15, 1995 | Ratification: December 30, 1995 | | |
| Lao People's Democratic Republic | | Accession: July 23, 1997 | | |
| Malaysia | December 15, 1995 | | | |
| Myanmar | | Accession: July 23, 1997 | | |
| Philippines | December 15, 1995 | Ratification: March 18, 1996 | | |
| Singapore | December 15, 1995 | Ratification: December 29, 1995 | | |
| Thailand | December 15, 1995 | Ratification: December 28, 1995 | | |
| Viet Nam | December 15, 1995 | Acceptance: January 22, 1997 | | |