The present document identifies ETSI specifications for TETRA V+D and DMO Release 2.1. Release 2.0 specifications were functionally frozen after the 28th TC TETRA meeting in October 2006. Release 2.1 specifications contain corrections and enhancements to the Release 2.0 since publication of the Release 2.0 including TEDS Direct Access@ Net Assist Protocol@ Direct mode Over The Air Management protocol and new parts to the User Requirements Specification in addition to maintenance of the TETRA standards and reports. NOTE 1: Functionally frozen means that no further functionality/features may be incorporated into the set of specifications@ and that only corrective Change Requests (CRs) are to be accepted and agreed. NOTE 2: It can be expected that corrective CRs will be introduced into the Release 2.1 specifications. NOTE 3: Some of the CRs that will be produced will be for the next Release as they add new functionalities/features. NOTE 4: Some of the documents were in Public Enquiry@ One step Approval or National Voting stage at the publication of the present document. Due to those stages editorial modifications may be performed and the version number of the document may step up in the last digit in addition to the normal step-up due to publication or voting. The resulting version is also a part of the present Release 2.1.