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If you wish to record call details to RADIUS Accounting Server(s), you must choose an Accounting Mode (i.e., the way you want the SBC to send those call record details):

• Active-Standby Mode
  In the Active-StandBy mode, all accounting related requests are sent to the first accounting server (A-Server One) when it is UP. That is when it is pingable and active. In the event Server One becomes unreachable, accounting requests are then sent to the second accounting server (A-Server Two).
  If A-Server One and A-Server Two become unreachable CDR information is backed up and queued for retry on the Sonus SBC 2000 hard drive. On the Sonus SBC 1000, if an eUSB device is present, the Call Detail Records (CDRs) will be queued on the eUSB device up to a limit of 1,500 records.
• Active-Active Mode
  In the Active-Active mode, all accounting requests are sent to both A-Servers. If one of the servers becomes unreachable, a retry procedure is executed. If the retry procedure fails, an alarm is raised every five minutes until the server becomes reachable again.
  If any or both servers become unreachable, the records are queued as described for the Active-StandBy Mode.
• Round Robin Mode
  In the Round Robin Mode, accounting requests are alternated between A-Server One and A-Server Two. The first, third, fifth, etc., (odd numbered) requests are sent to A-Server One and the second, fourth, sixth, etc. (even numbered) are sent to A-Server Two. All the call-legs belonging to the same call will go to the same server. These legs will be linked with a unique Acct-Multi-Session-Id per call. When only one server is reachable, all the accounting packets will go to same server. If both servers become unreachable, the records are queued as described for the Active-StandBy Mode.

Specifies the RADIUS server to use as either Primary or Secondary for RADIUS Authentication. Servers selected for accounting must be configured for accounting and assigned to the correct UDP Port (Normally, Port 1813) for RADIUS accounting. Although you must specify at least one RADIUS Accounting server, Sonus recommends you use two.