this is the config we are running. we can dial a Windows XP machine in using PSTN no problem, however ISDN will authenticate the link, and then can't negotiate a PPP link
this is the config we are applying
version 12.4
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec
service timestamps log datetime msec show-timezone
service password-encryption
!
hostname xxx
!
boot-start-marker
boot-end-marker
!
card type e1 0 0
logging buffered 4096 informational
enable secret xxxxxx
!
aaa new-model
!
!
aaa authentication login default local
aaa authentication login console local
aaa authentication ppp default group radius
!
!
aaa session-id common
clock timezone GMT 0
clock summer-time GMT recurring
network-clock-participate wic 0
network-clock-select 1 E1 0/0/0
!
modem call-record terse
modem country v12 e1-default
modem recovery threshold 10
no ip source-route
!
!
ip cef
no ip dhcp use vrf connected
ip dhcp bootp ignore
!
ip dhcp pool dialinusers
network xxxxx xxxxxx
default-router xxxxx
dns-server xxxxxxx xxxx
!
!
no ip domain lookup
multilink bundle-name authenticated
isdn switch-type primary-net5
isdn voice-call-failure 0
!
!
!
!
!
username xxxxxx password xxxxxx
archive
log config
logging enable
logging size 200
hidekeys
path flash:archeived-config
maximum 14
write-memory
time-period 1440
!
!
controller E1 0/0/0
pri-group timeslots 1-31
!
!
!
!
interface FastEthernet0/0
description "xxxxxx"
ip address xxxx xxxxxx
no ip redirects
duplex auto
speed auto
no cdp enable
!
interface FastEthernet0/1
description "xxxxxx"
ip address xxxxx xxxxxx
no ip redirects
duplex auto
speed auto
no cdp enable
!
interface Serial0/0/0:15
description "D Channel interface for the Primary Rate ISDN"
no ip address
encapsulation ppp
ip mroute-cache
dialer rotary-group 1
dialer-group 1
isdn switch-type primary-net5
isdn incoming-voice modem
no fair-queue
no cdp enable
!
interface Dialer1
no ip address
encapsulation ppp
dialer in-band
dialer idle-timeout 2147482
dialer-group 1
no peer default ip address
no fair-queue
no cdp enable
ppp multilink
!
interface Group-Async1
description "Global Interface for PRI Dial-In Connections"
ip unnumbered FastEthernet0/0
encapsulation ppp
dialer in-band
dialer idle-timeout 0
async mode interactive
peer default ip address dhcp-pool dialinusers
no fair-queue
ppp authentication eap
no ppp chap wait
ppp multilink
group-range 0/386 0/421
!
ip route xxxx xxxx FastEthernet0/0
ip route 1xxxx xxxx FastEthernet0/0
ip route 1xxx xxx FastEthernet0/1
!
!
no ip http server
no ip http secure-server
!
dialer-list 1 protocol ip permit
no cdp run
!
radius-server host xxxxx auth-port 1645 acct-port 1646
radius-server timeout 10
radius-server key xxxxxx
!
control-plane
line con 0
login authentication local
line aux 0
exec-timeout 0 1
no exec
transport output none
line 0/386 0/421
login authentication console
modem Dialin
modem autoconfigure discovery
rotary 1
terminal-type length
transport input all
autoselect during-login
autoselect ppp
line vty 0 4
exec-timeout 0 1
no exec
transport input none
transport output none
scheduler allocate 20000 1000
many thanks in advance
