An E1 R2 Channel Associated Signaling (CAS) protocol stack should be available in C source code and should support ITU MF R2 signaling per Q.421 and Q,422
An E1 R2 source code library should support Maintenance operations for:
An E1 R2 SDK should support Alarms capability per 1.431, G.732 and ETSI 300-233
An E1 R2 stack should support line encoding for HDB3 and CMI
An E1 R2 stack should support Multi-Frequency (MF) signaling for at least sixteen country variants