Defaulted debt securities: transactions permitted after issuer or debenture trustee intimation, with mandatory disclosure and timelines. Issuers must promptly intimate payment status of debt securities; Stock Exchanges suspend trading two working days before redemption and Depositories restrict transfers on and after maturity until status is determined. If issuers do not notify, Debenture Trustees shall assess and report payment status within nine working days of maturity. Upon intimation of default, Depositories and Exchanges shall lift restrictions within two working days, flag the ISIN as 'ISIN-defaulted in redemption,' disseminate the status, permit reporting of OTC trades with explicit default warnings, and notify account holders of the defaulted status.