In the dynamic roaming table entry in Table 4 , the learning counter is updated to indicate that 10 1 learning transactions have been performed. The status field is set to validate to indicate that validation testing is being performed. Returning to Figure 3, in line 2 of the message flow diagram, routing node 100 sends an anytime interrogation message to HLR 200$_{.}$ In line 3, HLR 200 responds with an anytime interrogation response including the old VLR ID of 5678 and an age of location parameter of 30. Routing node 100 performs a lookup in the dynamic roaming table and determines that the velocity check fails because 30 is less than 120. After 100 failed validations, the status of the entry in the dynamic profile is set to blacklisted. In line 4 of the message flow diagram, routing node 100 sends a send authentication information/location update message to home HLR 200$_{.}$ Thus, in test mode, even though the status of an entry is changed to blacklisted, messages from foreign networks may continue to be forwarded to home network nodes. In test mode it should also be noted that new entries are added to the dynamic profile table with graylisted status. Validation pass and fail counts are updated based on results of the validation testing, which in this instance involves a velocity check. Dynamic profile table entries are updated with learn counts based on the number of successful and unsuccessful validations performed. New entries are created in the dynamic roaming table. In the new entries in the dynamic roaming table, the time threshold is updated with the minimum threshold of all of the age of location values in received ATI response messages from home HLR 200 for the particular VLR, provided that the VLR is whitelisted. Updating the time threshold with the minimum value encountered in age of location parameters for a whitelisted VLR avoids the need for manually determining a reasonable time threshold to include in a velocity check. Figure 4 is a message flow diagram illustrating exemplary operation of routing node 100 when operating in active mode. As stated above, in active mode, validation testing is performed but new entries are not created in dynamic profile table with graylisted status. Validation counts (pass and fail) are updated. Dynamic profile table entries may be changed to whitelisted or