Example accounting packets, Receive fax stages, Start – FaxBack Port Server RADIUS Support (RFC 2865, 2866) User Manual
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FaxBack Proprietary and Confidential
Page 43 of 58
An Accounting Start packet (Acct-Status-Type=Start) is sent after a client has been approved to 
send a fax. This means that the client has sent a “send request” to the connection server, and 
the connection server has successfully contacted a port session server that accepted the new 
session. The client is provided with the Url of the port session server, and the client is expected 
contact this server to perform the fax session. 
 
An Accounting Alive/Interim packet (Acct-Status-Type=Alive-Interim-Update) is sent after the 
sending client successfully contacts the port session server for the first time. Typically first 
contact between the client and port session server occurs before the fax session (T.30) has 
begun. 
 
An Accounting Stop packet (Acct-Status-Type=Stop) is sent after the end of the session. 
Receive Fax Stages
An Accounting Start packet (Acct-Status-Type=Start) is sent after an inbound call has been 
successfully routed to a client. This means that a port session server has detected an inbound 
call, sent the DID in an “answer request” to a connection server, and the connection server has 
determined which client should receive the fax. The User Name in the Start packet (and all 
subsequent Accounting packets for this session) represents the account that should be billed, 
however, the client that physically receives the fax may be a client logged in as that account, or a 
“failover receive account” that the primary account has specified as an alternate. The client is 
provided with the Url of the port session server, and it is expected to contact this server to 
perform the fax session. 
 
An Accounting Alive/Interim packet (Acct-Status-Type=Alive-Interim-Update) is sent after the 
receiving client successfully contacts the port session server for the first time. Typically first 
contact between the client and port session server occurs before the fax session (T.30) has 
begun. 
 
An Accounting Stop packet (Acct-Status-Type=Stop) is sent after the end of the session.
Example Accounting Packets
All possible attributes are listed in these examples, even if the string values are empty. By 
default, the port server will construct packets that include attributes even if the string value is 
empty. 
Start
───
SENT FROM PORT SERVER
──►
 
Code=Accounting-Request(4) 
Packet identifier=2 
Length=113 
Authenticator 
 1D 9E 3F A4 3A 45 6E 44 BF 91 D8 27 7A 30 EB 20 
Attributes: 
Len=6, Type=Acct-Status-Type(40) 
 Value=Start(1) 
Len=9, Type=User-Name(1) 
 Value=account 
Len=20, Type=Vendor-Specific(26), Id=FaxBack(30694) 
 Len=14, Type=FB-Dial-Number(34) 
 Value=555-123-2134 
Len=12, Type=Vendor-Specific(26), Id=FaxBack(30694) 
