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1.  If the value is a fixed value, then use the hexadecimal form of the value. For example, if the value is "123", then use "313233".
2.  If the value is a dynamic value, then use the function "bytes" to get the value. For example, "domain.name.bytes", "groups.name.bytebytes", etc

There are several other RADIUS attributes that are defined as "octets" Please refer to:

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