Implementation.of.Presence-Enabled.Services
The key network/service delivery elements (Day, Rosenberg, & Sugano, 2000) for providing
presence-enabled service are as follows.
From Figure 1, the following basic service elements can be identified from the viewpoint
of a customer company for setting up the SLA performance parameters:
1. Presence user agents
2. Presence network agents
a. IP MS (IP multimedia subsystems)
b. MSC (Mobile switching centers)
c. IMSA (Instant messaging service agents)
In the next section, we discuss SLA and the SLA components of presence-enabled services.
Main.Thrust.of.the.Chapter
Service.Level.Agreement.(SLA).For.Presence-Enabled.....
Services.
Typical SLAs identify and define the service offering itself, plus the supported products,
evaluation criteria, and QoS (Quality of Service) that customers should expect. It includes
the responsibilities of an IT services provider (such as an ISP or ASP), reflects the rights
of the service provider??™s users, and also includes the penalties assessed when the service
provider violates any element of the SLA.
SLAs are the key to ensuring consistent QoS, performance, and uptime in business-critical
computing environments, and they complement other contractual agreements that cover a
variety of details, including corrective actions, penalties and incentives, dispute-resolution
procedures, nonconformance, acceptable service violations, reporting policies, and rules for
terminating a contract.
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