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GSM (Voice Call - 2) - 18

Voice Call continued [Under GSM >> Signaling]

Step 2: Authentication, Ciphering

MS1 BTS1 BSC1 MSC1 VLR1
MAP - Process Access Request


VLR1 VLR2
MAP - Send Identification
MAP - response for Send Identification


MS1 BTS1 BSC1 MSC1 VLR1
MAP - Authenticate
DTAP (Authentication Request)
RLM (Authentication Request)
SDCCH, MM - Authentication Request
SDCCH, MM - Authentication Response
RLM (Authentication Response)
DTAP (Authentication Response)
MAP - Authenticate Response
MAP - Set Ciphering
BSSMAP - Cipher Mode Command
DCM (Encryption Command)
SDCCH, RR - Cipher Mode Command
SDCCH, RR - Cipher Mode Complete
RLM (Ciphering Mode Complete)
BSSMAP - Cipher Mode Command
MAP - Process Access Accepted

We will continue "Voice Call" in next article.

References: GSM Networks book by Heine, GSM book by Mouly and Pautet, Signaling diagrams from 24.007/24.008 (R99).

© Copyright Samir Amberkar 2010

Voice Call - 1 « GSM Index » Voice Call - 3