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Figure 3-10 Charging state machine for client 
Figure 3-11 Charging state machine for proxy-relay 
Both sending and receiving messages are covered in these two figures. In addition it 
shows inter-TMMS PR routing. Inter-TMMS PR routing is covered here since it uses the 
same SIP MESSAGE request as clients do. 

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3.2 TMMS Service based on GPRS: : Design 
Page 39 of 93 
When the TMMS PR receives a MESSAGE request it will start processing it by checking 
if a CDR is attached. A CDR can be piggy backed in the request by using a multipart 
Multipurpose Internet Mail Extensions (MIME) [36] type as the body of the request. An 
example of such a composite message is given in Appendix D: mm-charging.msg. If no 
CDR is attached then the TMMS PR will create a standard CDR, where the sender is 
charged. In either case the CDR will be routed to the Charging Control associated with 
the network. How the TMMS PR discovers the correct Charging Control is described 
below. The message will now be split by the TMMS PR so the CDR is sent to the 
Charging Control and the message received from the sender is routed to the destination, 
using standard routing mechanisms. Destination here means either the recipient or the 
recipient's TMMS PR if it is in a remote network. 
Another scenario covered is when a client receives a notification about a new message. 
To disallow senders to trick the recipient to pay for unwanted messages, the newmessage 
notification contains the CDR which the client application uses to first ask the receiver if 
it wants to be charged for that message. 
How the CDR is transmitted to the Charging Control is not specified in OMA WBF, and 
is implementation dependent. The same applies here, since this is up to the Charging 
Control to specify, which is out of scope for this report. E.g. this could be a HTTP 
POST request. The details of how the Charging Control and the Business Support works 
are also out of scope for this report. Some information on that topic is given in the 
OMA WBF specification.