March 2006
Intermediate to advanced
464 pages
12h 16m
English
book
The IMS: IP Multimedia Concepts And Services, Second Edition
by Miikka Poikselka, Georg Mayer, Hisham Khartabil, Aki Niemi
Content preview from The IMS: IP Multimedia Concepts And Services, Second Edition
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4.7. Presentity list
It is envisioned that users (watchers) will have many presentities (friends) whose presence information is of interest to them. For congestion control and bandwidth limitations, it is uneconomical to have the user's terminal send a multiplicity of SUBSCRIBE requests, one for each presentity.
To resolve this problem, Group Management solutions were created. Section 8.3 discusses Resource lists in more detail. A presentity list is a type of resource list:
Application Usage ID (AUID) – "resource-lists".
Additional constraints – none.
Naming convention – none.
Resource interdependencies – the list is represented by a Universal Resource Identifier (URI). If the client does not populate the XML element carrying the URI value, the XML Configuration Access Protocol (XCAP) server needs to do so.
Authorization policy – default.
The Ut interface in the IMS architecture is used to manipulate resource lists.
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