What does the heading code (H0, H1) tell us? What is the purpose of circuit continuity? Explain ? Address signals (such as telephone number digits) are sent digit by digit embedded in the last subfield in the SIF. How are they represented? (Hint: per digit) ? Give two examples of backward information in SS No. 7. 35. What facilitates end-to-end signaling typically for ISUP (i.e., what "part" of SS No. 7)?