RAEX IR.21 is a well-established format for MNOs to inform their roaming partners about changes that these need to implement in their network. But is the format itself reliable enough to cover all affected network components like different firewalls, VLR, HLR, border gateways, billing system, monitoring system, etc.?
To keep it short, the answer is yes. But with new technologies coming into place and new data to be implemented in the network, the RAEX IR.21 schema and tools need to be updated regularly and many MNOs should be more accurate with their data before publishing their files