This is the ABCD bit pattern this gateway is currently transmitting outbound on the DS0's CAS line signaling, what this end is telling the far end about local call state. This is the mirror image of ccasILSRxPattern; where that object shows what is being received, this shows what is being sent, so comparing the two during a troubleshooting session tells an admin whether a call-setup stall is on the local transmit side or the remote receive side. During an active call, this object might steadily read the off-hook/answer pattern while a technician confirms the far end's incoming pattern reads the same value, proving the line signaling itself is not the source of a reported call issue.