3.12.1. Feature Description 
MFC/R2 is a telephony signaling protocol which is used to provide
signaling between switches. Signaling can be done over analog (TMxxx)
or digital (DIUx) trunks with CAS (channel associated signaling).
MFC-R2 signals are provided from vSIUX2. SIUX functionality has been
introduced as virtual board for OpenScape 4000 SoftGate/OpenScape Access/Branch
500.
Figure 140. MFC-R2
For more details about MFC-R2, please refer to the service documentation:
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OpenScape 4000, Section 3 - Feature Usage Examples > Networking > MFC-R2 Signaling