Yes. The CTM service provides cross-referencing for security codes for TBAs that one counterparty represents as CUSIP and the other as ISIN. If the underlying security is the same, the CTM service matches on the field.
Security identifier cross-referencing steps
1. Investment manager and broker/dealer create TBA trades with information about the type of financial instrument, security code and numbering agency/country code.
2. CTM accepts the ISIN security code from the investment manager and CUSIP security code from the broker/dealer.
3. CTM cross-references the security identifiers with the corresponding security codes and the trade progresses to MACH status.