| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
| Brunei Darussalam | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Cambodia | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Indonesia | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Lao People's Democratic Republic | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Malaysia | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Myanmar | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Philippines | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Singapore | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Thailand | | Definitive Signature: January 28, 1992 | January 28, 1992 | |
| Viet Nam | | Definitive Signature: January 28, 1992 | January 28, 1992 | |