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Billability 
Table 5-6: Evaluation of Billability quality attribute for TMMS Service based on OSA API 
I1: Send and receive messages with GSM SMS clients
 
The Service can use Multimedia Messaging SCF to send messages to a GSM SMS 
client. 
R1: Proxy-Relay routes messages at most once
The TMMS PR uses a Cseq number in the SIP messages to ensure that a message 
is only routed once to each recipient.
R2: Service stores messages until it has been delivered
 
When user has retrieved message, the service deletes message from message store.
B1: Service provider must get information about chargeable operations
The TMMS PR uses Charging SCF to charge for service usage 
B2: Message charged at most once
The cdr-id attribute in the cdr element which identifies each CDR gets 
transformed and the Charging SCF may use it to ensure that the transformed 
CDR is only used once. 
B3: Sender may demand that the recipient is charged for the message
If the sender includes a CDR in the body of the message sent to the TMMS PR 
the recipient(s) will be charged for the message. Also the sender may demand 
what amount the recipient(s) are charged for each media type included in the 
message. 
B4: Sender can not deceive receiver to pay for any messages
 
Receiver is asked for charging confirmation by the TMMS PR. 

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6.1 TMMS Service based on OSA Parlay X Web Services: : Overview 
Page 74 of 93 
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TMMS Service based on OSA Parlay X Web Services 
In this chapter we will first give a brief introduction of the OSA Parlay X Web Services 
[45], which is the technology our end-to-end mobile service designed in this chapter is 
based on OSA Parlay X Web Services. We continue this chapter with presenting how we 
have chosen to design our OSA Parlay X Web Serves based service, before we end this 
chapter with an evaluation of the service, based on the criteria and scenarios in .