Its all about Channelized E1….. And the Modem CSM
MICA (Modem ISDN channel aggregation)
c3725
isdn switch-type primary-net5
!
controller E1 1/0
pri-group timeslots 1-31
!
interface Serial1/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn incoming-voice modem
no cdp enable
!
line 65 94
modem InOut
transport input all
In modern c3825
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version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
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hostname C3825-30DM
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boot-start-marker
boot-end-marker
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card type e1 0 0
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no aaa new-model
network-clock-participate wic 0
ip cef
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ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
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isdn switch-type primary-net5
voice-card 0
no dspfarm
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controller E1 0/0/0
pri-group timeslots 1-31
!
controller E1 0/0/1
!
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interface GigabitEthernet0/0
no ip address
shutdown
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
media-type rj45
!
interface Serial0/0/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn incoming-voice modem 56
no cdp enable
!
ip forward-protocol nd
!
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no ip http server
no ip http secure-server
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control-plane
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voice-port 0/0/0:15
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line con 0
line aux 0
line 1/0 1/29
modem InOut
transport input all
line vty 0 4
login
!
scheduler allocate 20000 1000
!
end