Back to back T1/E1 configuration

GuyManDude

I need help getting back to back T1/E1 working please. I have been trying to create a simple lab where 2 CME routers can dial between the phone each one has registered. These phones can call each other over a frame-relay link so I'm sure my problems are related to dial peer config or controller configs.

Here is my basic dial peer and controller configs:


R1
network-clock-participate wic 0

dial-peer voice 1 pots
destination-pattern 2...
port 0/0/0:23

ephone 1
button 1:1

ephone-dn 1 dual-line
number 1001

interface Serial0/0/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn incoming-voice voice
isdn protocol-emulate network
isdn incoming-voice voice
!

R2
network-clock-participate wic 0

dial-peer voice 1 pots
destination-pattern 1...
port 0/0/0:23

ephone 1
button 1:1

ephone-dn 1 dual-line
number 2001

interface Serial0/0/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn incoming-voice voice
isdn protocol-emulate network
isdn incoming-voice voice
!

When I try to call between phones I get the invalid number tone and I can see from debugs that I have no matching outgoing dial peer but I don't understand why. If I simply change the dial-peer 1 ports/voip type and the 'port port 0/0/0:23' statement to session target ipv4.x.x.x the calls work. I have also tried with various permutations of commands like the isdn incoming-voice voice and isdn protocol-emulate network under the t1 serial interfaces but nothing has worked so far.

Any help you can offer will be much appreciated.

tokhss

what i dont see in your config is a controller .. sounds like you may have a t1 controller.

controller T1 0/2/0
cablelength short 133
pri-group timeslots 1-5,24

as you can see.. im only using 5 channels above.

interface Serial0/2/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn incoming-voice voice
no cdp enable



also, setup your first DID DP, its generic and it works.

dial-peer voice 1 pots
incoming called-number .
direct-inward-dial

now setup your direct phone # to whatever location your trying to reach.
example..

dial-peer voice 550 pots
description to blah blah other router
destination-pattern 21255052..
no digit-strip
port 0/2/0:23
forward-digits all

pitviper

You want to use the "isdn protocol-emulate network" command on one side only (typically on the telco cloud in the lab) - the other side should be user (which is default).

Also, make sure that you are using a T-1 crossover cable and that the lights are good (green) on both serial interfaces.

As tokhss said, you also need an incoming dial-peer on each side:

dial-peer voice 1 pots
incoming called-number .
direct-inward-dial
port 0/0/0:23

And watch the digit strip on the POTS dial-peers...

azaghul

you'll also need to set the controller on one router to send clocking, and the other to receive clock

GuyManDude

Thanks guys. I got it working. To help others that will inevitably find themselves in the same predicament I was, here are the configs for R1 and R2 that worked for me:

Remember, these are CME routers...

hostname R1
!
network-clock-participate wic 0
!
ip dhcp excluded-address 1.0.0.0 1.255.255.250
!
ip dhcp pool PSTN
network 1.0.0.0 255.0.0.0
default-router 1.1.1.1
option 150 ip 1.1.1.1
!
isdn switch-type primary-ni
!
controller T1 0/0/0
clock source internal
pri-group timeslots 1-6,24
!
interface FastEthernet0/0
ip address 1.1.1.1 255.0.0.0
!
interface Serial0/0/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable
!
voice-port 0/0/0:23
!
dial-peer voice 1 pots
incoming called-number .
no digit-strip
direct-inward-dial
port 0/0/0:23
forward-digits all
!
dial-peer voice 2 pots
destination-pattern 2...
no digit-strip
port 0/0/0:23
forward-digits all
!
telephony-service
max-ephones 1
max-dn 2
ip source-address 1.1.1.1 port 2000
max-conferences 8 gain -6
!
ephone-dn 1
number 1001
label R1 phone 1
!
ephone 1
device-security-mode none
mac-address 0026.CBBE.29C3
button 1:1


hostname R2
!
network-clock-participate wic 0
!
ip dhcp pool PSTN
network 2.0.0.0 255.0.0.0
default-router 2.1.1.1
option 150 ip 2.1.1.1
!
isdn switch-type primary-ni
!
voice-card 0
!
controller T1 0/0/0
pri-group timeslots 1-6,24
!
interface FastEthernet0/0
ip address 2.1.1.1 255.0.0.0
!
interface Serial0/0/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn incoming-voice voice
no cdp enable
!
voice-port 0/0/0:23
!
dial-peer voice 1 pots
incoming called-number .
no digit-strip
direct-inward-dial
port 0/0/0:23
forward-digits all
!
dial-peer voice 2 pots
destination-pattern 1...
no digit-strip
port 0/0/0:23
forward-digits all
!
telephony-service
max-ephones 1
max-dn 2
ip source-address 2.1.1.1 port 2000
!
ephone-dn 1
number 2001
label R2 Phone 1
!
ephone 1
device-security-mode none
mac-address A40C.C395.84FB
button 1:1

pitviper

Yep, that looks better! Good work!

The "no digit-strip" and "forward-digits all" commands both accomplish the same thing .

Any plans to setup a telco cloud?

GuyManDude

Any plans to setup a telco cloud?

Absolutely! I am planning on studying the entire CCIE voice track so I can feel strong with the voice knowledge but don't plan on taking the CCIE lab unless my employer wants to pay for it.

What I learned today was the past piece of the physical networking that I didn't know! Now I'm in good shape.

pitviper

Nice! Once you get the PSTN cloud setup the remote/branch site(s) dial-peers will be much cleaner. You’ll do most of your translations in the cloud and end result will be branch router configs that look 100% real world.

Sirsamon

Thanks, worked a treat for me