Gamma Three Trading's FIXHub solves the issues of having more than one Order / Execution Management System within a firm. There are many popular vendor based OMSs that excel at certain types of asset classes or workflows. Single trading system consolidation is often not an option, however the need for inter-OMS communication exists.
FIXHub allows for an OMS to route orders, allocations, executions, from one Order Management System desk to another, and receive updates (Fills, Allocations), issue cancels and corrects. All messaging is fully audited and FIX based.