Hello folks,

Please confirm IF my interpretations are correct. 

First,  the output of "ftdm r2 status <span>":

Tx CAS is  the AB bits sent TO the opposite end 

Rx CAS is the AB  bits rcvd FROM the opposite end 

Then, if this is the Called end, then ... 

Tx CAS is sending the Backward line signals to the Calling party

Rx CAS is the Forward line signals received from the Calling party

And, I want to make sure, if this is the Calling end, then

Tx CAS is sending the Forward line signals; and

Rx CAS is receiving the Backward lines signals