思科2621路由器拨号故障

思科2621配一拨号模块2AM 路由器使用正常,电话线路正常,在使用拨号模块时连接正常,但是2分钟准时自动掉线,请各位帮忙看一下,下面是配置信息:
sh run
Building configuration...

Current configuration : 2164 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname aaaa
!
boot-start-marker
boot-end-marker
!
logging buffered 99999 debugging
enable secret 5 $1$agIn$cw9N.rChcTZX47zPX1
enable password aaaa
!
username test password 0 test
aaa new-model
!
!
aaa authentication login default local
aaa authentication login VTY local
aaa authentication ppp default local
aaa authorization exec default local
aaa authorization network default local
aaa accounting delay-start
aaa accounting network default start-stop group radius
aaa session-id common
ip subnet-zero
!
!
!
no ftp-server write-enable
modemcap entry f2730:MSC=&F&D2S34=18000S40=10S53=0S54=456debugthismodemS71=4
modemcap entry  test:MSC=&F&D2S0=6S32=3S34=30000S40=10S53=0S54=58s50=50666
!
!
!
controller E1 1/0
!         
!
interface FastEthernet0/0
ip address 192.168.1.14 255.255.255.0 secondary
ip address 172.168.130.129 255.255.255.128
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.168.128.91 255.255.255.0
duplex auto
speed auto
!
interface Group-Async0
ip unnumbered FastEthernet0/1
encapsulation ppp
dialer in-band
dialer-group 1
async mode interactive
peer default ip address pool dialer
ppp max-bad-auth 3
ppp authentication pap
group-range 1 2
!
interface Dialer0
ip unnumbered FastEthernet0/1
encapsulation ppp
dialer in-band
dialer-group 1
peer default ip address pool dialer
ppp max-bad-auth 3
ppp authentication pap
ppp timeout retry 1
!
router ospf 100
log-adjacency-changes
redistribute connected metric-type 1 subnets
redistribute static metric-type 1 subnets
network 172.168.128.0 0.0.0.255 area 0
default-information originate
!         
ip local pool dialer 172.168.128.87 172.168.128.88
ip classless
ip route 192.1.1.0 255.255.255.0 172.168.130.130
no ip http server
!
!
line con 0
line 1 2
session-timeout 1200
exec-timeout 1200 0
modem InOut
modem autoconfigure type test
autocommand  ppp
transport input all
autoselect during-login
autoselect ppp
hold-character 0
stopbits 1
speed 115200
flowcontrol hardware
line aux 0
line vty 0 4
password aaaa
!
!
!
end

能拨号上来，配置可以说没问题，要排查，必须debug报文，辛苦一下把debug报文贴上来，掉线前一直到掉线的

谢谢楼上的

正在排查中,如果还是掉线的话我会把报文贴出来