understanding of concepts and terminology was also highlighted as a practical step for furthering international cooperation and building trust. Other such measures included developing guidance on the implementation of CBMs, training for diplomats, exchanging lessons on establishing and exercising secure crisis communication channels, personnel exchanges, scenario-based exercises at the policy level as well as operational exercises at the technical level between Computer Emergency Response Teams (CERTs) or Computer Security Incident Response Teams (CSIRTs). National transparency measures, such as voluntarily sharing responses to an implementation survey or issuing national declarations of adherence to the framework for responsible State behaviour, were suggested as other avenues to build trust and confidence regarding the intentions and commitments of States. 30. Taking into account the experiences of regional bodies with establishing and maintaining Points of Contact (PoC) networks, and building on existing networks, the viability of establishing a central global directory of PoCs was discussed. At the same time, it was noted that the security of such a directory as well as its operational modalities would be crucial to its effectiveness, as would avoiding duplicative or overly detailed arrangements. The value of regularly conducting exercises among a network of PoCs was also emphasized, as it can help to maintain readiness and responsiveness and ensure that PoC directories remain updated. 31. As CBMs can be developed at the bilateral, regional or multilateral levels, States also discussed the desirability and viability of establishing a global repository of CBMs under the auspices of the United Nations, with the objective of sharing policy, good practice, 4 A/69/723, referenced in A/70/174, para 12. 7