Опять банальная проблема...
Схема подключения
АТС (Ericsson AEX-10) ---->  Modem Tainet 1300 (G.703) -- 2Mб--> Modem Tainet 1300 (G.703)----> Cisco 3725.
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Натройки на модемах . Framing., Framing no crc. Да и еще Когда ставишь Unframing Модемы вяжутся и ошибок нет никаких, но ISDN Layer 1 Мертвый. В режиме Framing ISDN Layer 1  UP

но...
ISDN Serial2/0:15 interface
        ******* Network side configuration *******
        dsl 0, interface ISDN Switchtype = primary-net5
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = AWAITING_ESTABLISHMENT
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Active dsl 0 CCBs = 0
    The Free Channel Mask:  0x7FFF7FFF
    Number of L2 Discards = 0, L2 Session ID = 132
    Total Allocated ISDN CCBs = 0
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Насторойки маршрутизатора

Building configuration...

Current configuration : 4819 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
card type e1 2

isdn switch-type primary-net5
isdn voice-call-failure 0
!
controller E1 2/0
framing NO-CRC4
pri-group timeslots 1-31

!
interface Serial2/0:15
no ip address
encapsulation ppp
ip mroute-cache
dialer rotary-group 1
dialer-group 1
isdn switch-type primary-net5
isdn overlap-receiving
isdn not-end-to-end 64
isdn protocol-emulate network (Пробовал и User)
isdn incoming-voice modem
isdn send-alerting
!

interface Group-Async1
ip unnumbered FastEthernet0/0
encapsulation ppp
ip tcp header-compression
load-interval 30
async dynamic routing
async mode interactive
peer default ip address pool default
ppp authentication chap pap
group-range 33 62
!

3725#sh interfaces serial 2/0:15
Serial2/0:15 is up, line protocol is up (spoofing)
  Hardware is M32X with CSU/DSU
  MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 1 seconds on reset
  Last input never, output 00:00:03, output hang never
  Last clearing of "show interface" counters 19:38:25
  Input queue: 0/75/59/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/1/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 48 kilobits/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 5 runts, 0 giants, 0 throttles
     73 input errors, 14 CRC, 47 frame, 0 overrun, 0 ignored, 33 abort
     31416 packets output, 94248 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions
  Timeslot(s) Used:16, Transmitter delay is 0 flags

3725#sh controllers e1
E1 2/0 is up.
  Applique type is Channelized E1 - balanced
  Description: E1 # 2516109
  No alarms detected.
  alarm-trigger is not set
  Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.
  Module type is Channelized E1/T1 PRI
  Version info Firmware: 0000001D, FPGA: 0
  Hardware revision is 0.0         , Software revision is 29
  Protocol revision is 1
  number of CLI resets is 0
    receive remote alarm  :    0,
    transmit remote alarm :    0,
    receive AIS alarm     :    1,
    transmit AIS alarm    :    0,
    loss of frame         :    1,
    loss of signal        :    0,
    Loopback test         :    0,
    transmit AIS in TS 16 :    0,
    receive LOMF alarm    :    0,
    transmit LOMF alarm   :    0,
  MIB data updated every 10 seconds.
  Data in current interval (546 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
  Total Data (last 78 15 minute intervals):
     1 Line Code Violations, 133 Path Code Violations,
     0 Slip Secs, 1 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins,
     2 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 14 Unavail Secs

У кого есть мысли в чем беда? Прошу поделится !