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Terminating side of the session 
Since the service will only store and forward incoming messages it is only 
required to be part of the session on the terminating side. IMS routing 
will take care of the originating side. 
Note that this will enable the service for all MESSAGE requests, which is not always 
desired. By adding a header like "X-TMMS-Message" and a SPT which requires this 
header to be included in the request, the service will only be invoked for these special 
MESSAGE requests. 

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4.2 TMMS Service based on IMS: : Design 
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4.2.3
 
Component view 
Figure 4-6 Component view for IMS based service 
The figure above gives a high level overview of the components of the system, and 
shows the components which TMMS Service is dependent on. In the following 
subsection the internal components of TMMS Client is described2.4 above. 
The internal components of TMMS PR are not described here since that is out of scope 
for this report. 
4.2.3.1
 
TMMS Client 
Figure 4-7: Component view for TMMS Client 
The TMMS Client has a 
TMmsClient.Communication.Ims
package which contains its own 
implementation, 
ImsMessaging
, of the 
TmmsClient.Communication.Messaging
interface. 
ImsMessaging
uses the SIP API component to communicate with the TMMS PR. 
4.2.4
 
Security 
The service trusts IMS to provide a secure environment. Only authorization for service 
usage is dealt with by the service itself. 

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4.2 TMMS Service based on IMS: : Design 
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4.2.5