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Real-time Mantra >
IMS Call Flows > PSTN to IMS Call Flow
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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.
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The diagrams in this page were generated with
EventStudio System Designer 4.0. |
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 |
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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) |
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The following diagram adds more details. CSCF
level details are added.High
Level Flow (With CSCF Details)
pdf |
IMS Media Gateway (IM-MGW) Role |
Media Gateway Control Function (MGCF) Role |
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I-CSCF Role |
Terminating S-CSCF Role |
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