I have finally found out what the prefix 502 is for. It is used for data telephone calls and will be allowed by exception only. If you need to have access to this service you will probably need to contact the agency providing your DSN access and have it turned on.
It looks like they are trying to call a commercial phone number from a DSN line. These are the DSN prefixes 312 - CONUS; 314 - Europe; 315 - Pacific; 317 - Alaska; 318 - Central Command; 319 – Canada. I might be missing some of them but these are the major ones.
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