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Real-time Mantra > Telecom Call Flows
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 GSM Network Example |
This example shows a few cells in a GSM network. We will be referring to this diagram in several sequence diagrams and call flows. |
A detailed call flow of a GSM mobile originated call. |
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GSM Location Update
Sequence Diagram
pdf |
How does the cellular provider know where you are? Here we look at the location updating procedure initiated by mobiles to keep the cellular provider updated on their current location. |
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GSM Mobile Terminated Call Flow
pdf |
In this call flow we will look at how a terminating call is handled in GSM. Setting up a terminating call is a two step process. (1) Interrogation procedure to locate the subscriber (2) Actual call setup after the subscriber has been located. |
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GSM RR Call Flows
pdf |
GSM Radio Resource Management (RR) Call Flows. |
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GSM RR Collaboration Diagram
pdf |
GSM Radio Resource Management (RR) Collaboration Diagram. |
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GSM MM Call Flows
pdf |
GSM Mobility Management (MM) Call Flows. |
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GSM MM Collaboration Diagram
pdf |
GSM Mobility Management (MM) Collaboration Diagram. |
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GSM Handover Call Flow (Intra MSC)
pdf |
This call flow covers a simple case of call handover in GSM. Here a user has an active call and is moving from the Rockville Cell to the Bethesda Cell. |
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GSM
Inter-MSC Handover Call Flow
pdf |
This call flow describes the handover between two cells handled by different MSCs. |
 GSM
Inter-MSC Handover Call Flow (Explore More) |
Inter MSC handover is analyzed in detail. The role of each participant is documented with a separate call flow. |
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GPRS
Combined Attach and PDP Context Activation
pdf |
The combined attach and PDP context activation of a Class B GPRS terminal will be covered here. |
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New
SGSN Interfaces Attach and Activation
pdf |
Sequence diagram listing all the interactions involving the new SGSN. |
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User
Terminal Interfaces in Attach and PDP Activation
pdf |
Sequence diagram summarizing the user terminal interactions in attach and PDP context activation. |
SIP and H.323 Call Flow Diagrams |
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SIP
to PSTN Call Flow
pdf |
Call flow describing the setup and release of a SIP to PSTN voice call. |
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SIP
to ISDN PBX Call Flow
pdf |
SIP terminal to ISDN PBX Call. |
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H.323
Call Flow
pdf |
H.323 call flow covering H.225, Q.931, H.245, RTP and RTCP protocols. |
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H.323
Context Diagram
pdf |
Context diagram describing H.323 interfaces. |
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IMS
Registration |
An IMS terminal accesses the home IMS via a visited IMS. Unauthenticated registration followed by authenticated registration is covered here. |
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IMS
to IMS Call Flow |
Call flow for an IMS subscriber to another IMS subscriber is covered here. |
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PSTN
to IMS Call |
A ISUP to IMS call flow is described here. Megaco/H.248 interactions and ISUP-SIP interworking are covered in detail. |
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IMS
to PSTN Call |
Here we explore an IMS to PSTN terminating call. The call flow covers the IMS-ISUP interworking and Megaco/H.248 interactions between the MGCF and IM-MGW. Call routing via the BGCF is also illustrated. |
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SDP
Codec Selection and QoS Signaling in an IMS call
pdf |
An IMS call is analyzed with a focus on the SDP interactions involved in codec selection and PDP context activation. |
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IMS
Presence Subscription and Notification |
IP Multimedia Subsystem (IMS) provides a framework for building advanced telecom services. One such service is network wide publication and subscription of presence information. |
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IMS
Presence Resource List Subscription and Notification |
This scenario describes how a user can subscribe to a predefined list of subscribers via a Resource List Server. The RLS handles the interactions needed for presence subscription for individual users on that list. |
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IMS
Conference Call
pdf |
Setup of an IMS conference call with REFER based invitation to other subscribers. |
An ISUP Incoming to ISUP Outgoing transit call is covered here. Call is released first by the called subscriber. |
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An ISUP Incoming to ISUP Outgoing transit call is covered here. Call is released first by the calling subscriber. |
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An ISUP Incoming to ISUP Outgoing transit call is covered here. Call is released on receipt of call failed indication from called side. |
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Setup and release of a V5.2 subscriber to V5.2 subscriber call. Calling subscriber uses DTMF dialing and the called subscriber goes onhook. |
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Setup and release of a V5.2 subscriber to V5.2 subscriber call. Calling subscriber uses pulse dialing and calling subscriber clears first |
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