RADIUS

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.