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Framework 
The framework provides basic functionality for applications so they can 
use the service capabilities available to them. 
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Service Capability Servers 
Gives access to some network functionality for the application to use. 
To get access to the network the application must perform three steps. First it must 
contact the framework, then authenticate with the framework and if authentication 
succeeds it may authorize with the network and starts discovering which Service 
Capability Features (SCFs) are available. 
5.1.1
 
Service Capability Features 
Network functionality offered to applications is described through SCFs. A network 
provider may only support a subset of the SCFs described in the OSA API specification 
[TS29.198], and the application can find out which are available through discovery. This 
also makes it possible to easily add new services without breaking old applications. 
Several SCFs are defined: Call Control, Data Session Control, Terminal Capabilities, 
Mobility, User Interaction, Charging, Account Management, Presence, and Multimedia 
Messaging. 

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5.1 TMMS Service based on OSA API: : Overview 
Page 65 of 93 
5.1.2
 
Charging 
OSA supports different kinds of charging for services, and is based on a subscriber’s 
account. An application can charge the subscriber’s account for both e-commerce (like 
shopping of books, food and ringtones) and service usage (like chatting and call 
forwarding). 
From [44], assuming that the underlying network supports the features, the Charging 
SCF can be used by a service to: 
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Check, if – for the service to be provided by the application – the charge 
is covered by the subscribers account or credit limit. 
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Reserve – for the service to be provided by the application – a charge in 
the subscribers account, that can be deduced from the account after 
service delivery. 
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Deduct an amount from the subscriber's account.
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Release a reservation acquired earlier.
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Add non-monetary units to a subscriber's account. 
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Deduct non-monetary units from a subscriber's account. 
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Reverse a completed charge transaction, e.g. after repudiation. 

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5.2 TMMS Service based on OSA API: : Design 
Page 66 of 93