• Each channel on T1/E1 will consume 1 DSP resource.
• The signaling channel '24' on T1 and '16' on E1 do not consume any DSP.

• Specify the as T1. Otherwise the controller config won’t appear without this
• Configure the isdn switch type globally
• Configure the T1 channels. The signaling channel 24 is automatically inserted.
• Specify the ISDN switch type on the interface. Most of the config on the Serial interface is automatically generated even the switch type if defined globally.
• isdn incoming-voice voice will cause incoming voice call to be routed to a voice DSP instead of to a modem

card type t1 0 1
!
network-clock-participate wic 0
!
isdn switch-type primary-net5
!
controller T1 0/0/0
 pri-group timeslots 1-10,24

! *** The following are auto generated
interface Serial0/0/0:23
 no ip address
 encapsulation hdlc
 isdn switch-type primary-ni
 isdn incoming-voice voice
 no cdp enable

• For fractional T1, configure channel selection order to use channel 1 first

interface Serial0/0/0:23
  isdn bchan-number-order ascending

• Specify the as E1. Otherwise the controller config won’t appear without this
• Configure the ISDN switch type globally
• Configure the E1 channels. The signaling channel 16 is automatically inserted.
• Specify the ISDN switch type on the interface. Most of the config on the Serial interface is automatically generated even the switch type if defined globally.
• isdn incoming-voice voice will cause incoming voice call to be routed to a voice DSP instead of to a modem

card type e1 0 1
!
network-clock-participate wic 0
!
isdn switch-type primary-net5
!
controller E1 0/0/0
 pri-group timeslots 1-10,16

! *** The following are auto generated upon entering the above commands
interface Serial0/0/0:15
 no ip address
 encapsulation hdlc
 isdn switch-type primary-net5
 isdn incoming-voice voice
 no cdp enable

• For fractional E1, configure channel selection order to use channel 1 first

interface Serial0/0/0:15
  isdn bchan-number-order ascending

• Framing - ESF, Linecode - b8zs are the default
• Group channel 1-12 as DS Group 1 with e&m-wink-start signaling

controller t1 1/0
  framing esf
  clock source line
  linecode b8zs
  ds0-group 1 timeslots 1-12 type e&m-wink-start

• Configure all 12 channels as a single DS Group 1

voice-port 1/0:1
  cptone US
  compand-type u-law
  no shut

• If we want to receive ANI (Caller ID) information in both direction
• E&M FGD can only receive ANI for inbound call
• E&M FGD EANA can only send ANI for outbound call

controller T1 0/0/0
  framing esf
  linecode b8zs
  ds0-group 0 timeslots 1-12 type e&m-fgd
  ds0-group 1 timeslots 12-24 type fgd-eana
!
dial-peer voice 1 pots
  incoming called-number .
  direct-inward-dial
!
dial-peer voice 90 pots
  destination-pattern 9T
  port 0/0/0:1

• The grouping of channels as DS Group 0 is as if the first framing channel is not even considered.

controller E1 0/0/0
  ds0-group 0 timeslots 1-31 type r2-digital r2-compelled ani
  cas-custom 0
    country china use-defaults
!
dial-peer voice 90 pots
  incoming called-number .
  destination-pattern 9T
  direct-inward-dial
  port 0/0/0:0

• Display the E1/T1 controller status and function e.g. up/down, framing, line code — etc

Router# show controllers {t1 | e1} 1/0

• Configure T1 as above
• Configure clocks internal
• Configure Emulate Networks

controller T1 0/0/0
 clock source internal
!
interface Serial0/0/0:23
 isdn protocol-emulate network

• Configure E1 as above
• Configure clocks internal
• Configure Emulate Networks

controller E1 0/0/0
 clock source internal
!
interface Serial0/0/0:15
 isdn protocol-emulate network

• Show controller detail including framing, line code and clock source

router# show controllers t1   

T1 0/3/0 is up.
  Applique type is Channelized T1
  Cablelength is long 0db
  Description: PSTN
  No alarms detected.
  alarm-trigger is not set
  Soaking time: 3, Clearance time: 10
  AIS State:Clear  LOS State:Clear  LOF State:Clear 
  Version info Firmware: 20090408, FPGA: 13, spm_count = 0
  Framing is ESF, Line Code is B8ZS, Clock Source is Line.
  CRC Threshold is 320. Reported from firmware  is 320.
  Data in current interval (649 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     178 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     178 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Total Data (last 24 hours)
     0 Line Code Violations, 0 Path Code Violations,
     23660 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
     23660 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

router#