
Applying MBT in the Telecommunication Domain 497
[MM]
prefix depicts a class method used at the MM protocol. The set of messages that
can be exchanged between the MSC Server (MSS) and the Mobile Subscriber (MS) at the
MM protocol are modeled by two different class interface elements (i.e., MM), one for each
direction of communication. The approach allows a clear separation of the communication
between different network elements and on different protocol levels. The domain model is
built iteratively and is mainly derived from the sequence diagrams and the architectural
requirements. Each lifeline in the sequence diagrams generates a new class, whereas