[cisco-nas] PRI Problem

[Voralt]

We have a PRI for ISDN calls and we have been having some problems with
certain users for the last 24 hours.  Some users can call in and connect and
no matter what channel they are on, they work fine (they can drop the call
and call back and it works fine).  Some users call in and have tons of
dropped packets (if they drop and call back, they still have problems).
There have been no IOS or config changes for at least a week.  The PRI
itself is clean, but the individual channels show errors.  Any idea what
could cause this?  If it was 1 user, I would blame them, but there are 3-4
that just started having this problem recently and there are 3-4 that work
fine.  The PRI is clean, so I can't imagine where the errors are
originating.  Maybe at the calling CO?  Here is some debug info:

T1 0/1 is up.  (PRI is clean)
  Applique type is Channelized T1
  Cablelength is long gain36 0db
  Description: XSpedius #1IBRYBRY0361 (800)9espire
  No alarms detected.
  alarm-trigger is not set
  Framing is ESF, Line Code is B8ZS, Clock Source is Line.
  Data in current interval (474 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 1:
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 2:
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 3:
     0 Line Code Violations, 0 Path Code Violations
     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs


Virtual-Access4, bundle name is xxxxxx  (This user has trouble)
  Bundle up for 10:05:19
  Dialer interface is Serial0/1:23
  9673 lost fragments, 15713 reordered, 2 unassigned
  31 discarded, 0 lost received, 1/255 load
  0xA354 received sequence, 0xA498 sent sequence
  Member links: 2 (max not set, min not set)
    Se0/1:8, since 10:05:19, last rcvd seq 00A353
    Se0/1:9, since 10:05:16, last rcvd seq 00A356

GW1#sh int s 0/1:8
Serial0/1:8 is up, line protocol is up
  Hardware is DSX1
  MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
     reliability 157/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set
  Keepalive not set
  LCP Open, multilink Open
  Last input 00:00:02, output 00:00:00, output hang never
  Last clearing of "show interface" counters 10:27:22
  Input queue: 0/75/12517/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair  [suspended, using FIFO]
  FIFO output queue 0/40, 0 drops
  5 minute input rate 0 bits/sec, 1 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     14429 packets input, 1016185 bytes, 0 no buffer
     Received 0 broadcasts, 3169 runts, 0 giants, 0 throttles
     12517 input errors, 9617 CRC, 2900 frame, 0 overrun, 0 ignored, 61
abort
     21311 packets output, 1509725 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions
  Timeslot(s) Used:9, Transmitter delay is 0 flags


Virtual-Access6, bundle name is yyyyyyy  (This user is fine)
  Bundle up for 10:16:01
  Dialer interface is Serial0/1:23
  0 lost fragments, 7 reordered, 0 unassigned
  0 discarded, 0 lost received, 1/255 load
  0xD63F received sequence, 0x1E319 sent sequence
  Member links: 2 (max not set, min not set)
    Se0/1:6, since 10:16:01, last rcvd seq 00D63E
    Se0/1:7, since 10:15:59, last rcvd seq 00D63D

GW1#sh int s 0/1:6
Serial0/1:6 is up, line protocol is up
  Hardware is DSX1
  MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set
  Keepalive not set
  LCP Open, multilink Open
  Last input 00:16:15, output 00:00:02, output hang never
  Last clearing of "show interface" counters 10:27:48
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair  [suspended, using FIFO]
  FIFO output queue 0/40, 0 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     29754 packets input, 1540137 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     64197 packets output, 33275654 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions
  Timeslot(s) Used:7, Transmitter delay is 0 flags