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PSTN Subscriber to IMS Subscriber Call Flow

This call flow covers the handling of a CS network originated call with ISUP. In the diagram the MGCF requests seizure of the IM CN subsystem side termination and CS network side
bearer termination. When the MGCF receives an answer indication, it requests the IM-MGW to both-way through-connect the terminations. Originating and terminating end initiated call releases are also covered.

PSTN to IMS Call Flow pdf PSTN to IMS Call Flow 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: pstn-ims-call.zip

The call flow is explained below by focusing on a different aspects of PSTN originated and IMS terminated call flow.

Call Overview

The following diagram provides an overview of the message interactions. Interaction details and remarks are omitted from the diagram.

PSTN to IMS Call Overview pdf

High Level Summary

This diagram analyzes the PSTN-IMS call at a high level. The message flow between the PSTN end, IMS and the called UE is the focus of this diagram.

High Level Flow (PSTN-IMS-Called UE) pdf

High Level Summary (CSCF Level Detail)

The following diagram adds more details. CSCF level details are added.

High Level Flow (With CSCF Details) pdf

IMS Media Gateway (IM-MGW) Role

IM-MGW Call Flow pdf
IM-MGW Context Diagram pdf

Media Gateway Control Function (MGCF) Role

MGCF Call Flow pdf
MGCF Context Diagram pdf

I-CSCF Role

I-CSCF Call Flow pdf
I-CSCF Collaboration Diagram pdf

Terminating S-CSCF Role

Terminating S-CSCF Call Flow pdf
Terminating S-CSCF Context Diagram pdf

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