E1 Line-Side configuratio

Unanswered Question
Jan 21st, 2009

Hi experts,

One of our customers ask me if Cisco support line-side configuration in an E1.

Does anyone know how to accomplish this task?

I already do some research with no result.

Best Regards

I have this problem too.
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Nicholas Matthews Wed, 01/21/2009 - 13:57

Could you expand on what you mean by line side?

FWIW, the E1 can be configured for both network/server/provider or client/user.

If you want to emulate the network, use this command:

interface Serial0/0/0:15

isdn protocol-emulate network



Paolo Bevilacqua Wed, 01/21/2009 - 14:23

interface serial x/y

isdn protocol-emulate network

Use a crossed cable

That's it.

Hope this helps, please rate post if it does!

abrenes26 Wed, 01/21/2009 - 14:36


I think I didn't explain well.

What I mean is an E1, using CAS signaling with the protocol Line-side. This is a configuration used by a client using an Avaya system connect to an IVR, both equipments use this protocol. The customer want to replace the Avaya equipment with an Cisco gateway.



abrenes26 Wed, 01/21/2009 - 14:53

The Country is Costa Rica.

The configuration is against an IVR system and the manufactured just accept line-side protocol.

The line-side protocol just run in a E1 R2?, this is something I don't understand yet.

There is some documentation where I can read something?



Nicholas Matthews Wed, 01/21/2009 - 15:00

Hi Andre,

E1 R2 should be configured the same on both sides, and this will work. Just ensure that one side is clock source line, and one is clock source internal.



Nicholas Matthews Wed, 01/21/2009 - 15:25

Hi Andres,

If they have an E1 CAS circuit, it is more than likely an E1 R2 circuit.

You can read the theory here:


You would need to find out the Line Signaling in use (maybe this is what you're referring to as Line-side), and the Interregister Signaling in use.

The Line will be analog, digital, or pulse and the interregister will be compelled, non-compelled, or semi-compelled.

There are country defaults you can try, for example:

controller E1 0/1/0

ds0-group 1 timeslots 1-31 type r2-digital r2-non-compelled

cas-custom 1

country costarica



Paolo Bevilacqua Wed, 01/21/2009 - 15:28

Hola, E1 R2 doesn't have a line side, being it essentially a trunk protocol.

So, connect your PBX using a crossed T1/E1 cable (NOT crossed ethernet), configure router for what the PBX is expecting, and you should be done.

Vladimir Lozano... Thu, 12/06/2012 - 12:10

Hi abrenes26,

Did you make these work. We are currently trying to make this configuration (Lineside) with a Gw 2921 (IOS 15.1) and Avaya S8700.

Actually it is Working this configuration with Aspect CSS and is required to achieve the same with Gw 2912.


Paolo Bevilacqua Thu, 12/06/2012 - 12:13

3 years old thread, please read and use search function, then if still trouble post new thread.

Vladimir Lozano... Fri, 02/08/2013 - 09:06

Hi Paolo,

I undestand, but we are in hurry, these is really important and a prerequisite.

Thank you, anyway.

Best regard.



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