Microsoft Word Master master doc

Confidentiality 
By encrypting the message content only recipients who know how to decrypt it 
may know the content of the message. 

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3.3 TMMS Service based on GPRS: : Evaluation 
Page 41 of 93 
3.3.2
 
Usability 
Table 3-2: Evaluation of Usability quality attribute for TMMS Service based on GPRS 
3.3.3
 
Modifiability 
Table 3-3: Evaluation of Modifiability quality attribute for TMMS Service based on GPRS 
U1: Distribution of the client application 
Customer must manually retrieve the client application. 
U2: Which parameters are necessary for the client to communicate with the 
Proxy-Relay
Parameters needed are: the TMMS PR IP address, local port number and server 
port number. 
U3: Address handling (GSM SMS vs. TMMS addresses)
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SIP URIs are used to address TMMS Clients, and TEL URIs are used to address 
GSM SMS clients. Only the PR must treat these different. 
U4: Client registration 
Client must register with the TMMS PR by issuing a SIP REGISTER request. 
U5: Client un-registration
Registration 
Clients must un-register with the TMMS PR by issuing a SIP REGISTER request 
with the Expires-header set to 0. 
M1: Add more servers to achieve better scalability
Scalability 
Since the TMMS PR is addressed through DNS it is possible to use normal DNS 
based network load balancing techniques to add more servers. 
M2: Extend the service to support new media types 
The service uses MIME types to describe the media types of the message body. 
M3: Restrict the media types supported by the service 
The TMMS PR may filter the media types in a message, based on the Content-
Type, to restrict which media types are allowed to be sent between the clients.
M4: Support new Carrier Access Network (CAN) 
The service is dependent on a packet switched data network. As long as the CAN 
provides such support it may be used by the service. 
M5: Port the service to a different framework