Name

Callback-ID

Synopsis

Attribute Number

20

Length

3 or more octets

Value

STRING

Allowed in

Access-Accept

Prohibited in

Access-Request, Access-Reject, Access-Challenge

Presence in Packet

Not required

Maximum Iterations

1

This attribute is used when a RADIUS implementation is set up to return a user’s call. This is commonly used in corporate situations to avoid long-distance charges in hotel rooms and other remote locations. This value, a STRING, is often the identifier for a profile configured on the service equipment; there is no specific standard for a string name, a triggered action, or something else. In other words, it is environment-specific. RADIUS client gear is allowed to reject a connection if this attribute is present but not supported by that gear.

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