[cisco-voip] ISR 4431 - Need to configure "clock source internal" on PRI interface , get error

Ryan Huff ryanhuff at outlook.com
Tue Oct 27 21:23:57 EDT 2015


You'll essentially be doing the same thing as you would have in the ISRG2 but as you've discovered, the syntax has changed a bit in the 4k's. I've included the relevant portion of a t1 config on a 4k in my lab below. Here is the link for 4th gen NIM t1 configurations (I'd suggest a good read here, a lot of syntax has changed that might leave you scratching your head): http://www.cisco.com/c/en/us/td/docs/routers/access/interfaces/NIM/software/configuration/guide/ConfT1E1NIM.html

Hope This Helps,


|----- CONFIG SAMPLE -----|

card type t1 0 2
isdn switch-type primary-ni
network-clock synchronization automatic
network-clock synchronization participate 0/2
voice-card 0/2
dsp services dspfarm
controller T1 0/2/0
framing esf
linecode b8zs

clock source line primary

network-clock input-source 1 controller t1 0/2/0
cablelength long 0db
pri-group timeslots 1-24 voice-dsp
interface Serial0/2/0:23
encapsulation hdlc
isdn switch-type primary-ni
no cdp enable


|----- CONFIG SAMPLE -----|

From: cisco-voip <cisco-voip-bounces at puck.nether.net> on behalf of Brian V <bvanbens at gmail.com>
Sent: Tuesday, October 27, 2015 8:42 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] ISR 4431 - Need to configure "clock source internal" on PRI interface , get error

I have a ISR 4331 that I'm configuring for voice PRI support.

Performing an integration with a Nortel PBX (back to back PRI) where i need to be the clock source on the underlying T1 circuit.

In the past on ISR G2 platforms (like a 2921),  I could configure "clock source internal" under the controller T1 interface.  On the 4331 I get the following error when the clock source it set to internal under the controller T1

TIV-4331-01-TEMP(config-controller)#pri-group timeslots 1-24

%Cannot create ds0/tdm/pri-group with clock source internal

%pri-group voice-dsp cannot be created under the clock source configuration

How do I accomplish the same on this newer platform or is it no longer possible ?

The NIM does have it's own DSP resources.

I can get the integration up and working, with the default "clock source line",  but I  get slips on the t1 as the Nortel side is free running  and looking to the line as a clock source on its end.

I hope I'm just missing something obvious.


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