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New Member

setup voice PRI T1 using VWIC2-2MFT-T1/E1

I am trying to setup PRI T1 using VWIC2-2MFT-T1/E1. I wasn't able to bring up this T1 with local provider. This is what I have on my router.


isdn switch-type primary-ni


controller t1 0/0/0

framing esf

lincode b8zs

pri-group timeslots 1-24


interface Serial0/0/0:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

no cdp enable


Anything do I have to worry about to bring this T1?



New Member

Re: setup voice PRI T1 using VWIC2-2MFT-T1/E1

Hi Peter,

Since this is a voice circuit, I'd try removing the "encapsulation hdlc" on the Serial0/0/0:23 statement.

Also, you didn't mention what platform you're using this VWIC2 on. I have done a number of deployments on the 2821 ISR platform, which required additional configuation to bring up the VWIC with the provider. I use:

network-clock-participate wic 0

network-clock-select 1 t1 0/0/0

Hope that helps,


New Member

Re: setup voice PRI T1 using VWIC2-2MFT-T1/E1

i tried to remove the "encapsulation hdlc" from the same interface on a router that I have, and it takes the command with no errors. But when I do a show run, "encapsulation hdlc" is still on the interface. Am I correct in assuming that it is there by default, but does not normally show up in the config?

New Member

Re: setup voice PRI T1 using VWIC2-2MFT-T1/E1


Did my suggestion provide any traction for your issue?


Re: setup voice PRI T1 using VWIC2-2MFT-T1/E1

JFO and Peter,

I have seen that hdlc encap command in the new 12.4 IOS. Doesnt do any harm though. You cannot remove it.

Peter, what does a show isdn status give ya ?