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Scenario Implementations 
In the sequence diagrams below the message paths have been simplified, to only include 
communication relevant to the service. Nodes which are not included are P-CSCF, I-
CSCF and I-CSCF (THIG). This communication is described in [38]. 
4.2.5.1
 
S01: TMMS Client Registration 
To get notifications about new messages the client needs to subscribe to the 
“newmessage-alert” event. 
Figure 4-8: TMMS Client registration 
When the TMMS PR receives the SUBSCRIPTION request it tries to download its 
Repository Data from the HSS. This data is used to authorize the request, and if no data 
is found then the request will not be authorized. TMMS PR sends a 403 (Forbidden) 
response and a 403 (Forbidden) response. 
According to [29]the notifier must immediately send a NOTIFY message to the user 
with the current state after a successful subscription. This message will contain a body 
with URIs to all new messages for the client, if any. The URIs are retrieved from the 
Repository Data pulled from the HSS in step 1.1.1. How the client handles the NOTIFY 
message is discussed in 4.2.5.3. 

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4.2 TMMS Service based on IMS: : Design 
Page 54 of 93 
4.2.5.2
 
S02: Send MM 
The client composes a MM and sends it to the recipient(s). Standard IMS routing 
principles will take care of routing the MM to the recipient(s). This is described in clause 
5.16 in [38]. Here it is assumed that a list server is already present in the network to allow 
clients to send a message to multiple recipients. 
Figure 4-9: TMMS Client Sends MM 
After the TMMS PR has sent the response back to the originator it stores the message in 
the Repository Data section of the recipient's service profile. Then a newmessage-alert 
notification is sent to all subscribers matching the Request-URI of the original SIP 
MESSAGE request. 
For interoperability with GSM SMS a IP Short Message Gateway (IP-MESAGE-
GW)[53] node may be present in the network, which will relay messages between IMS 
and GSM SMS clients..