IP Multimedia Subsystem (IMS) Call Flows
The sequence diagrams were generated using EventStudio System Designer.
IP Multimedia Subsystem (IMS) Sequence Diagrams
An IMS terminal accesses the home IMS via a visited IMS. Unauthenticated registration followed by authenticated registration is covered here.
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.
SDP Codec Selection and QoS Signaling in an IMS call
An IMS call is analyzed with a focus on the SDP interactions involved in codec selection and QoS.
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.
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.
IMS Conference Call
Setup of an IMS conference call with REFER based invitation to other subscribers.