[USR-TC] my modems are shifted (1) TDM slot

What would be the correct command to fix this problem. S1-S4 are un-usable my first modem starts at s5 how would I fix this, any ideas? show sess S1 A I P on - Netwrk IDLE 0 0 0 S2 A I P on - Netwrk IDLE 0 0 0 S3 A I P on - Netwrk IDLE 0 0 0 S4 A I P on - Netwrk IDLE 0 0 0 S5 A R P on - Netwrk IDLE 0 10 0 S6 A R P on - Netwrk IDLE 0 10 0 S7 A R P on - Netwrk IDLE 0 10 0 S8 A R P on - Netwrk IDLE 0 10 0 Thank you!