Basically the flow is as follows -

–        the subscriber dials #777 and places a data call

–        the MIN is validated by the MTX

–        the BSC forwards the session request from the PCF to the PDSN

–        the PDSN and the handset begin negotiating a PPP session (LCP phase)

–        the MN supplies a user name and password

–        the PDSN forwards an Authentication request to the RADIUS Authentication server

• if the Authentication server reply with a REJECT the PDSN tears down the session
• if the Authentication server does not reply the PDSN retries until it receives a reply or retries are exhausted.  If retries are exhausted the PDSN tears down the session
• If the Authentication server reply with an ACCEPT the PDSN continues with the session setup

–        the PDSN completes setting up the PPP session to the MN and allocates an IP address

–        the PDSN sends an Accounting START request to the RADIUS Accounting server

• if the Accounting server does not reply the PDSN keeps retrying
• if the Accounting server reply  with an acknowledgement the subscriber’s session is allowed to start

–        traffic flows over the subscriber’s session until the session is terminated

–        radio resources are released

–        the PDSN sends an Accounting STOP request to the RADIUS Accounting server

If the Accounting server does not reply the PDSN keeps retrying

Incoming search terms for the article:

• cdma data call flow (26)
• PPP session in CDMA (15)
• evdo call flow diagram (10)
• cdma 1x call flow (5)
• cdma data flow (5)
• cdma PDSN 1X Call flow (2)
• #777 data call (1)
• RTT CDMA message flow (1)
• lcp call flow in cdma pdsn (1)
• full cdma pdsn call flow (1)