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GSM Origination Call

GSM user to PSTN originating call is described here. The different call phases are covered in detail:

  • RR connection establishment.
  • Ciphering
  • SCCP connection establishment and call setup with the MSC
  • ISUP call setup with PSTN
  • Call Release

GSM Originating Call Flow pdf                                 GSM Originating Call Poster (11x17) pdf

The diagrams in this page were generated with EventStudio System Designer 4.0.
The source files for the diagrams can be downloaded from: gsm-call-flow.zip

The call flow is explained below by focusing on a different aspects of inter-MSC handover call flow.

Call Overview
The following diagram provides a single sheet overview of the message interactions. Interaction details and remarks are omitted from the diagram.

 GSM Originating Call Overview pdf                 GSM Originating Call Context Diagram pdf

Mobile, GSM Network and PSTN Interactions
This diagram treats the whole GSM network as a black box and focuses on the interactions between the Mobile, the GSM network and the PSTN.

 Mobile, GSM Network and PSTN Level Call Flow pdf

Mobile, BSS, NSS and PSTN Interactions
Get a mobile, BSS, NSS and PSTN level view.

 GSM Mobile, BSS, NSS and PSTN Level View pdf

Mobile Role
The role of a GSM mobile in the call flow is covered here.

Mobile Role Call Flow pdf                                                  Mobile Role Context Diagram pdf

Base Station Role
The role of a GSM base state in call setup is described here .

BSC Call Flow pdf                                                               BSC Context Diagram pdf

MSC-VLR Role
The following diagrams focus on MSC-VLR's role in originating GSM call setup.

MSC-VLR Call Flow pdf                                                   MSC-VLR Context Diagram pdf

PSTN Role
The PSTN role in call setup is the focus of the following diagrams:

PSTN Call Flow pdf                                                          PSTN Context Diagram pdf
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