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Real-time Mantra >
IMS Call Flows > IMS to PSTN Call Flow
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This call flow describes the call setup from
an IMS subscriber to ISUP PSTN termination. The call is routed via the BGCF
(Border Gateway Control Function) to the MGCF (Media Gateway Control
Function). The MGCF uses one context with two terminations in IM-MGW (Media
Gateway). The termination RTP1 is used towards IMS Core network subsystem
entity and the bearer termination TDM1 is used for bearer towards PSTN CS
network element..
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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 IMS originated and PSTN terminated call flow.
Call Overview |
The following diagram provides an overview of the message interactions. Interaction details and remarks are
omitted from the diagram. IMS
to PSTN Call Overview
pdfIMS
to PSTN Call Context Diagram
pdf |
High Level Summary |
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This diagram analyzes the IMS-PSTN 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 (Calling UE-IMS-PSTN)
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 and H.248 Details)
pdf |
IMS Media Gateway (IM-MGW) Role |
Media Gateway Control Function (MGCF) Role |
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BGCF Role |
Terminating S-CSCF Role |
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