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E1R2 - is inter-register signaling configuration necessary?

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Jan 11th, 2009
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Hi all,

Would like to know if inter-register signaling (such as R2-compelled, R2-non-compelled) necessary for a E1R2 configuration?

I would like to integrate Cisco 2811 with NEC Neax 2000 using E1R2.


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Nicholas Matthews Sun, 01/11/2009 - 20:14
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It will be necessary, yes. There is information passed with the inter-register signaling that is required for call setup.

Here's a good document on E1 R2 theory:


Also there's the little problem that the Cisco IOS CLI requires the inter-register signaling type when you define the ds0-group.

Router(config-controller)#ds0-group 1 timeslots 1-15 type r2-digital ?

dtmf DTMF tone signaling

r2-compelled R2 Compelled Register Signaling

r2-non-compelled R2 Non Compelled Register Signaling

r2-semi-compelled R2 Semi Compelled Register Signaling

Some interop documents:


E1 R2 with NEC PBX using 3745:




boonchin.ng Sun, 01/11/2009 - 22:56
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Hi Nick,

Thanks for the quick reply. Hope you don't mind me to ask another question,

Do you have any experience if two-stage dialing is supported over E1 R2 interface?


paolo bevilacqua Mon, 01/12/2009 - 08:41
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Two stages dialing will work on E1 R2 just like one stage works as well.


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