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Portability depends on the constraints of the new framework. 

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3.3 TMMS Service based on GPRS: : Evaluation 
Page 42 of 93 
3.3.4
 
Interoperability 
Table 3-4: Evaluation of Interoperability quality attribute for TMMS Service based on GPRS 
3.3.5
 
Reliability 
Table 3-5: Evaluation of Reliability quality attribute for TMMS Service based on GPRS 
3.3.6
 
Billability 
Table 3-6: Evaluation of Billability quality attribute for TMMS Service based on GPRS 
I1: Send and receive messages with GSM SMS clients
 
A TMMS message containing media types that a GSM SMS client doesn’t support 
is converted to a plain text message containing an URI which the recipient can 
use to see the message. A TMMS message which only contains plain text isn't 
converted since the GSM SMS client supports text. 
R1: Proxy-Relay routes messages at most once
The TMMS PR uses the 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 a user has retrieved a message, the service deletes messageit from the 
message store.
B1: Service provider must get information about chargeable operations
The TMMS PR sends charging information to a Charging Control which handle 
charging on behalf of the service provider. 
B2: Message charged at most once
The cdr-id attribute of the cdr element identifies each CDR, and the Charging 
Control may use it to ensure that a 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.