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 Te
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SIP URIs are used to address TMMS Clients, and TEL URI are used to address 
GSM SMS clients. 
U4: Client registration 
Clients must register with the TMMS PR by using a SIP REGISTER request. 
U5: Client un-registration
Registration 
Clients must un-register with the TMMS PR by using 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 is it 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. 
Only the client application must be upgraded to present new media types to the 
user. 
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) 
EMPTYEMPTY EMPTYEMPTY EMPTYEMPTY EMPTYEMPTY 
M5: Port the service to a different framework 
Chan
ge
 S
ervice 
EMPTYEMPTY EMPTYEMPTY EMPTYEMPTY EMPTYEMPTY 

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5.3 TMMS Service based on OSA API: : Evaluation 
Page 73 of 93 
5.3.4
 
Interoperability 
Table 5-4: Evaluation of Interoperability quality attribute for TMMS Service based on OSA API 
5.3.5
 
Reliability 
Table 5-5: Evaluation of Reliability quality attribute for TMMS Service based on OSA API 
5.3.6