Two nodes which have the main function to the EVDO call flow is PDSN and accounting server. Public Data Service Node (PDSN) is responsible to all the process related to data service session such handling Point to Point Protocol (PPP) session, allocation IP Pool, processing authentication authorization and accounting (AAA) process etc. meanwhile accounting server is responsible to the charging process of EVDO service. Accounting server will rate to any EVDO service packages and deduct subscriber balance. To execute this process, accounting server need to Intelligent Network (IN)
EVDO call flow on PDSN to accounting is related to charging purpose. This call flow describes how the session from EVDO subscriber comes to PDSN is happening and how the data call reach the accounting server and finally how the accounting server deduct the balance from Intelligent Network (IN). On the EVDO call flow, PDSN will receive accounting request from subscriber to accounting server. Usually PDSN will have more than 1 accounting servers. Some PDSN can do prioritizing and some PDSN can have more than one accounting server per domain. Accounting request which comes to PDSN then will be forwarded to the proper accounting server suppose primary accounting server. Then accounting server will check the DN subscriber whether they have sufficient right to access EVDO or not. If the user has sufficient rights then accounting server will response to PDSN for this session
The next step of EVDO call flow while accounting server responses the session is query the balance status to Intelligent Network (IN) before allowed to access EVDO service. There is particular protocol used by accounting server to check the status and reserve balance from IN. some accounting server will reserve a mount of balance before subscriber access the EVDO service. Since there are two types of EVDO service, prepaid and postpaid subscriber then there will be different call flow on the deduction process. The next step of EVDO call flow once the query and reservation balance to IN is complete is flowing traffic and service from subscriber to destination
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