The format used by the client for the Acct-Session-ID attribute
(attribute number 44):
decimal Use an ASCII decimal value only in the Acct-Session-ID
attribute.
description Use an ASCII description value which includes the
interface type (i.e. ATM), slot, port, and circuit
number (VPI and VCI for ATM), and a hexidecimal value
in the Acct-Session-ID attribute.