How to simulate ISDN Back To Back Configuration POTS Dial-Peers?

Connect two routers back-to-back style with cross over cable. Define switch type lets say qsig, then framing, line code, clock source, pri groups, user side, network side. (mean while forget about IP networks).

Here is one basic sample config, see how direct-indward-dial works, try some show and debug commands show isdn status, debug q931and q921 to see call set up signaling stuff.

(ISDN PRI Back To Back Configuration_Pots Dial-Peers)

USER SIDE CONFIGURATION
------------------------------
R1_3640#sh run
!
isdn switch-type primary-qsig
!
controller T1 1/0
framing esf
linecode b8zs
pri-group timeslots 1-4,24
!
interface Serial1/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-qsig
isdn incoming-voice voice
no cdp enable
!
voice-port 1/0:23
!
voice-port 3/0/0
!
dial-peer voice 1111 pots
destination-pattern 1111
port 3/0/0
!
dial-peer voice 2222 pots
destination-pattern 2222
direct-inward-dial
port 1/0:23
forward-digits all

-------------------------------
NETWORK SIDE CONFIGURATION
-------------------------------
R2_3725#sh run
!
isdn switch-type primary-qsig
!
controller T1 1/0
framing esf
clock source internal
linecode b8zs
pri-group timeslots 1-4,24
!
interface Serial1/0:23
no ip address
isdn switch-type primary-qsig
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable
!
voice-port 1/0:23
!
voice-port 2/0/0
!
dial-peer voice 2222 pots
destination-pattern 2222
port 2/0/0
!
dial-peer voice 1111 pots
destination-pattern 1111
direct-inward-dial
port 1/0:23
forward-digits all