Hi,
I will sugest you the following configuration changes:
1. In 'map-class frame-relay 128k ':
no frame-relay adaptive-shaping
frame-relay cir 128000
frame-relay mincir 128000
frame-relay bc 1280
frame-relay be 0
frame-relay fair-queue
frame-relay fragment 160
frame-relay ip rtp priority 16384 16383 ??? - you will decide how much
You must do this at both sides of the WAN link.
Your WAN Service provider must guarantee you this 128kpbs as a minimum!!!
use 'sh traffic-shape' to see if at both routers it looks like:
Interface Se3/0.6
Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes) Active
884 128000 160 1280 0 10 160 -
use 'sh frame-relay fragment' to see if fragmenting works:
Serial3/0.6 884 end-to-end 160 888107 8286890 0
if the last value 'dropped-frag' is increasing - this meen that your WAN provider not gives you the CIR 128000, and drops some or more of your fragments - take apropriate action.
Good Luck!
By the way, try to remove RTP and TCP header compressions if needed - it is very buggy at most of the IOSes.
