Cisco 1600 Frame-Relay Traffic shaping Inactive

Greetings all. I have a Cisco 1600 router oand im trying to get it to activate traffic shaping. My Cisco 2600s are active but the 1600s are unable. a show pvc gives me this

PVC Statistics for interface Serial0 (Frame Relay DTE)

DLCI = 46, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0.1

  input pkts 296736        output pkts 280416       in bytes 271200909
  out bytes 50347136       dropped pkts 0           in FECN pkts 291      
  in BECN pkts 0           out FECN pkts 0          out BECN pkts 0        
  in DE pkts 0             out DE pkts 0        
  out bcast pkts 4034      out bcast bytes 1452226  
  Shaping adapts to BECN
  pvc create time 2d20h, last time pvc status changed 00:12:15
  cir 128000    bc 16000     be 0         byte limit 2000   interval 125
  mincir 64000     byte increment 2000  Adaptive Shaping BECN
  pkts 280412    bytes 50345916  pkts delayed 1812      bytes delayed 1296005  
  shaping inactive    
  traffic shaping drops 0
  Queueing strategy: fifo
  Output queue 0/40, 0 drop, 1812 dequeued


Here is my show run for the serial interface
interface Serial0
 no ip address
 encapsulation frame-relay IETF
 no ip mroute-cache
 no fair-queue
 frame-relay traffic-shaping
 frame-relay lmi-type ansi
 
interface Serial0.1 point-to-point
 description 128Kbps Link
 ip address x.x.x.x y.y.y.y
 no ip mroute-cache
 frame-relay class cir128kbps
 frame-relay interface-dlci 46  

map-class frame-relay cir128kbps
 frame-relay cir 128000
 frame-relay bc 16000
 frame-relay be 0
 frame-relay adaptive-shaping becn



Is there something im not doing? thanks