Acct-Session-Id AVP ( 44 )
This attribute is a unique Accounting ID to make it easy to match
start and stop records in a log file. The start and stop records
for a given session MUST have the same Acct-Session-Id. An
Accounting-Request packet MUST have an Acct-Session-Id. An
Access-Request packet MAY have an Acct-Session-Id; if it does,
then the NAS MUST use the same Acct-Session-Id in the Accounting-
Request packets for that session.
Reference: RFC 2866
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