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4.1.7
 
Session Initiation Application 
The Session Initiation Application (SIA) is a terminal side application which allows a 
PPG to establish a push session or an active TCP connection using a special bearer. This 
application needs to be supported by both the terminal and the PPG. While the terminal 
has the SIA, the PPG has Session Initiation Requests (SIR) which the terminals listens to. 
In OTA-HTTP the SIR mechanism is used in cases like when the terminals IP address it 
not known by the PPG, and in cases when the PPG cannot activate the desired bearer. 
4.1.8
 
Security 
It is important that the PI gets authenticated and it exist several methods to do so. 
Among these are the uses of session-level certificates like TLS and Secure Sockets Layer 
(SSL), HTTP Authentication, a combination of those two mentioned and trusted 
networks. If a non-trusted or a non-authenticated PI tries to push content to a PPG, the 
PPG has the ability to perform filtering and access control to discard the pushed content. 
4.2
 
 Design 
4.2.1
 
Introduction 
The service acts as a SIP B2BUA in a SIP AS, connected to a S-CSCF. Also it… how 
does it communicate with GSM? 

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4.2 TMMS Service based on IMS: : Design 
Page 50 of 93 
It is designed to take advantage of as many of IMS' features as possible. 
4.2.2
 
Deployment view 
The figure below depicts how these components are deployed in an IMS network. 
Figure 4-4: Deployment diagram for IMS solution 
The next sections will describe in detail how the TMMS Client and the TMMS PR 
applications are deployed to their hosting environments. 
4.2.2.1