Isdn T-1 back to back routers problem

[pipemole]

To: tek-tips forums; wiring closet; Cisco Routers;
1/19/2004;
sbj: Isdn T-1 back to back routers problem

Hello:
In configuring / debugging ISDN T-1 connection between 2 routers, I ask your pointers. I am having difficulty getting calls to connect through t1 cabled connection between routers. There is a t1 crossover junction present. They both are Cisco AS5300 running IOS 12.2(10b). Call comes in router_A as VoIP of Sip variety. CalledNumber had form 971nnnmmmpppp, which is 13 numeric digits total.
At end of this message will be excerpts from the config. of both routers. This features settings to go with the current call type which is failing. Show Dial-peers Voice NNN on router A shows calls failed or refused. The same on router B indicates 0 calls. Show Controller t1 0, show int serial0:23 shows these 4 to be up. And the controllers show up as running for hours without errors or alarms.
Calls through router_A in either direction already work, when targeted to go through Voip (Sip) & T1 (of Channel Associated Signaling kind). So those controller and dial-peer definitions are not included in listing below.
Thanks in advance for your attention - - Pipemole - -

below, on router_B; selected parts to pass a call of current type;



isdn switch-type primary-5ess
voice call send-alert
voice rtp send-recv
!
voice service voip
modem passthrough nse codec g711ulaw maximum-sessions 6
!

!
voice class codec 1
codec preference 1 g723ar53 bytes 40
codec preference 2 g723r53
codec preference 3 g723ar63 bytes 48
codec preference 4 g723r63
codec preference 5 g729r8
codec preference 6 g729br8
!
voice class codec 2
codec preference 1 g723r63
codec preference 2 g729r8
!

!
controller T1 0
framing esf
linecode b8zs
pri-group timeslots 1-24
!

!
interface Serial0:23
no ip address
isdn switch-type primary-5ess
isdn incoming-voice modem
no cdp enable
!
!
interface FastEthernet0
ip address a1.b1.c1.d1 255.255.255.224
no ip mroute-cache
duplex full
speed 100
!

!
voice-port 0
output attenuation 3
!

!
dial-peer voice 1222 pots
destination-pattern 1T
info-digits 00
port 1:0
!
!
dial-peer voice 206 pots
destination-pattern 971..........
direct-inward-dial
prefix 1
!


below, on router_A selected parts;

isdn switch-type primary-5ess
voice call send-alert
voice rtp send-recv
!
voice service voip
modem passthrough nse codec g711ulaw maximum-sessions 6
!
voice class codec 1
codec preference 1 g723ar53 bytes 40
codec preference 2 g723r53
codec preference 3 g723ar63 bytes 48
codec preference 4 g723r63
codec preference 5 g729r8
codec preference 6 g729br8
!

!
controller T1 0
framing esf
clock source line primary
linecode b8zs
cablelength short 133
pri-group timeslots 1-24
!
!
interface Ethernet0
ip address a2.b2.2.1 255.255.255.0
ip access-group 103 in
no ip mroute-cache
!
!
interface Serial0:23
no ip address
isdn switch-type primary-5ess
isdn incoming-voice modem
isdn calling-number 1234567890
no cdp enable
!
interface FastEthernet0
ip address a2.b2.1.5 255.255.255.0
ip access-group 103 in
no ip mroute-cache
load-interval 30
duplex auto
speed auto
h323-gateway voip interface
h323-gateway voip bind srcaddr a2.b2.1.5
!

!
voice-port 0
!
!
dial-peer voice 206 voip
incoming called-number 971..........
session protocol sipv2
codec g711ulaw
!
dial-peer voice 208 pots
destination-pattern 971..........
direct-inward-dial
port 0
prefix 971
!
sip-ua
sip-server ipv4:a2.b2.2.6:5065
!

 

[NetEng631]

You need a ISDN simulator to connect to PRI together. An ISDN circuit is not a basic T1.

 

[BuckWeet]

under your serial itnerface for the ISDN

do this command

"isdn protocol-emulate network"