>Приведите конфиги и sh int обоих цисок, когда ppp не работает.

первая:

service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
no logging console
aaa new-model
aaa authentication login default line
aaa authentication login dialup group tacacs+
aaa authentication ppp dialup if-needed group tacacs+
aaa authorization network default local group tacacs+
aaa accounting exec default start-stop group tacacs+
aaa accounting system default start-stop group tacacs+
enable secret 5 $1$uRaG$ooV6S75fjI8NAP9jSrbWT/
!
username user password 7 03145A1815182E5E4A
username alex password 7 0207085E13575D72
ip subnet-zero
!
ip name-server x.c.e.t
!
ip audit notify log
ip audit po max-events 100
!
call rsvp-sync
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
!
interface Serial0/1
physical-layer async
ip address 10.0.1.2 255.255.255.252
encapsulation ppp
async default routing
async mode dedicated
peer default ip address 10.0.1.1
fair-queue
!
interface Group-Async0
ip address negotiated
ip access-group 120 in
encapsulation ppp
ip tcp header-compression
async mode interactive
peer default ip address pool MODEMS_POOL
ppp authentication pap dialup
group-range 33 48
!
ip local pool MODEMS_POOL 10.0.0.1 10.0.0.16
ip classless
ip route 0.0.0.0 0.0.0.0 10.0.1.1 100
ip http server
!
access-list 101 permit ip any host q.s.d.170
access-list 101 permit ip any x.c.r.0 0.0.255.255
access-list 101 deny   ip any any
access-list 120 permit tcp any host x.c.e.249 eq 4567
access-list 120 permit tcp any host x.c.e.117 eq domain
access-list 120 permit udp any host x.c.e.117 eq domain
access-list 120 permit icmp any host x.c.e.249
access-list 120 permit icmp any host x.c.e.117
access-list 120 deny   ip any any
tacacs-server host x.x.e.249
tacacs-server directed-request
tacacs-server key 7 106B021C171D04010409302721642321295C1E0512
!
dial-peer cor custom
!
line con 0
exec-timeout 0 0
password 7 08314D5D1A0E0A0516
line 2
stopbits 1
speed 19200
line 33 48
session-timeout 60
login authentication dialup
modem InOut
autocommand  ppp
stopbits 1
speed 19200
flowcontrol hardware
line aux 0
line vty 0 4
password 7 105E080A16001D1908
!
end

Serial0/1 is up, line protocol is down
  Hardware is PQUICC Serial in async mode
  Internet address is 10.0.1.2/30
  MTU 1500 bytes, BW 19 Kbit, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set
  Keepalive not set
  DTR is pulsed for 5 seconds on reset
  LCP Closed
  Closed: IPCP
  Last input 00:00:06, output 00:00:06, output hang never
  Last clearing of "show interface" counters 00:05:44
  Input queue: 1/75/0/0 (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 14 kilobits/sec
  5 minute input rate 0 bits/sec, 1 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     125 packets input, 1950 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
         149 packets output, 3176 bytes, 0 underruns
     0 output errors, 0 collisions, 28 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

и вторая:
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
interface Ethernet0
no ip address
shutdown
!
interface Serial0
no ip address
shutdown
!
..................
!
interface Serial9
physical-layer async
ip address 10.0.1.1 255.255.255.252
encapsulation ppp
async default routing
async mode dedicated
peer default ip address 10.0.1.2
!
interface BRI0
no ip address
shutdown
!
no ip classless
no logging console
!
line con 0
line 9
stopbits 1
rxspeed 19200
txspeed 19200
line aux 0
line vty 0 4
login
!
end

Serial9 is up, line protocol is down
  Hardware is CD2430 in async mode
  Internet address is 10.0.1.1/30
  MTU 1500 bytes, BW 19 Kbit, DLY 100000 usec, rely 255/255, load 1/255
  Encapsulation PPP, loopback not set, keepalive not set
  DTR is pulsed for 5 seconds on reset
  LCP TERMsent
  Closed: IPCP, CDPCP
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 1/75/0 (size/max/drops); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/1/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     98 packets input, 2299 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     2 input errors, 1 CRC, 1 frame, 0 overrun, 0 ignored, 0 abort
     90 packets output, 1404 bytes, 0 underruns
     0 output errors, 0 collisions, 19 interface resets
     0 output buffer failures, 0 output buffers swapped out
         0 carrier transitions