Cisco 3660 - ISDN Dialin problem

Hello

I have a problem with ISDN Dial-in to 3660 Cisco router. I have almost 35 computers (with ISDN cards) in distant locations. The problem is that when one of them dials in (connection type DATA) - the rest of them cant. My question is - is it a problem with wrong router configuration, or router can handle only one DATA connection at once?

Here is my config:

version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log datetime localtime
service password-encryption
!
hostname rt1
!
logging rate-limit console 10 except errors
enable secret 5 xxxxxxxxxxxxxxxxxxxxxxx.
!
username up97-406 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-407 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-408 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-319 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up26-307 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-212 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-318 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-505 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-545 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-410 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-415 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-524 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-512 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-565 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-561 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-352 password 7 xxxxxxxxxxxxxxxxxxxxxxx
username up97-515 password 7 xxxxxxxxxxxxxxxxxxxxxxx
clock timezone CET 1
clock summer-time EET recurring last Sun Mar 1:00 last Sun Oct 2:00
ip subnet-zero
no ip source-route
!
!
no ip finger
ip telnet source-interface FastEthernet0/0
ip tftp source-interface FastEthernet0/0
no ip domain-lookup
ip domain-name xxxxxxxxxxxxxxxxxxxxxxx
!
no ip bootp server
ip audit notify log
ip audit po max-events 100
!
!
isdn switch-type primary-net5
call rsvp-sync
!
!
!
!
!
!
!
controller E1 3/0
pri-group timeslots 1-31
!
!
interface Loopback0
ip address 10.215.255.1 255.255.255.255
!
interface Loopback1
ip address 10.215.255.2 255.255.255.255
!
interface FastEthernet0/0
ip address 10.215.0.1 255.255.255.0
duplex auto
speed auto
no cdp enable
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
no cdp enable
!
interface Serial1/0
no ip address
encapsulation frame-relay IETF
frame-relay lmi-type ansi
!
interface Serial1/0.1 point-to-point
ip address 10.211.64.2 255.255.255.252
ip access-group 102 in
no cdp enable
frame-relay interface-dlci 108
!
interface Serial1/0.2 point-to-point
ip address 10.211.64.17 255.255.255.252
no cdp enable
frame-relay interface-dlci 115
!
interface Serial1/0.3 point-to-point
ip address 10.211.64.9 255.255.255.252
no cdp enable
frame-relay interface-dlci 111
!
interface Serial1/0.4 point-to-point
ip address 10.211.64.73 255.255.255.252
no cdp enable
frame-relay interface-dlci 104
!
interface Serial1/0.5 point-to-point
ip address 10.211.64.37 255.255.255.252
no cdp enable
frame-relay interface-dlci 106
!
interface Serial1/1
no ip address
shutdown
no cdp enable
!
interface Serial1/2
no ip address
shutdown
no cdp enable
!
interface Serial1/3
no ip address
shutdown
no cdp enable
!
interface Serial3/0:15
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type primary-net5
isdn fast-rollover-delay 5
isdn incoming-voice modem
no fair-queue
no cdp enable
!
interface Group-Async0
ip unnumbered Loopback0
encapsulation ppp
async mode dedicated
peer default ip address pool ANALOG
no fair-queue
ppp lcp delay 60
ppp authentication chap pap
ppp ipcp dns 10.215.0.8
group-range 65 80
!
interface Dialer1
ip unnumbered Loopback1
encapsulation ppp
no ip mroute-cache
dialer pool 1
dialer-group 1
peer default ip address pool ISDN
no fair-queue
no cdp enable
ppp authentication chap pap callin
ppp multilink
!
router eigrp 12
redistribute static
passive-interface Serial1/0.2
passive-interface Serial1/0.3
passive-interface Serial1/0.4
passive-interface Serial1/0.5
network 10.0.0.0
no auto-summary
no eigrp log-neighbor-changes
!
ip local pool ANALOG 10.215.90.1 10.215.90.200
ip local pool ISDN 10.215.80.1 10.215.80.100
ip classless
ip route 0.0.0.0 0.0.0.0 10.208.0.1
ip route 10.215.33.0 255.255.255.0 Serial1/0.3
ip route 10.215.35.0 255.255.255.0 Serial1/0.2
ip route 10.215.40.0 255.255.255.0 Serial1/0.5
ip route 10.215.49.0 255.255.255.0 Serial1/0.4
ip route 10.215.80.0 255.255.255.0 Dialer1
ip route 10.215.90.0 255.255.255.0 Dialer1
no ip http server
!
logging facility local4
logging 10.32.0.16
access-list 102 deny tcp any any eq 445
access-list 102 deny tcp any any eq 9996
access-list 102 permit ip any any
dialer-list 1 protocol ip permit
no cdp run
!
dial-peer cor custom
!
!
!
!
!
line con 0
login local
length 25
transport input none
line 65 80
autoselect ppp
modem InOut
line 81 88
line aux 0
login local
modem InOut
length 25
transport input all
stopbits 1
flowcontrol hardware
line vty 0 4
login local
length 25
line vty 5 15
login
!
ntp clock-period 17180165
ntp server 10.208.0.1 prefer
end