Help with changes to configuration for our VoIP

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May 27th, 2007
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Hi All,


To most of those here, this is probably the most basic question you could get asked. I need some help with making a change to our configuration of our Cisco 2801 Router. This router is used for our VoIP services. The reason I am on here is more to confirm what I believe should be the change as I am not entirely confident on my Cisco skills yet(I have only just completed CCNA)


Our Service Provider has upgraded our service from 10 channels to 15 channels. I believe that the configuration I need to change is here:


controller E1 0/1/0

pri-group timeslots 1-10,16

description OPTUS circuit


And I need to change this to the following:


controller E1 0/1/0

pri-group timeslots 1-15,16

description OPTUS circuit


Now would this be right? And would anyone have any idea if there could be another area of the config that I might need to change?


Thanks for your help everyone!

Correct Answer by Paolo Bevilacqua about 9 years 10 months ago

Actually you have to shutdown the corresponding voice-port, remove current with "no pri-group" first, then issue "pri-group timeslots 1-16". Then no shutdown the voice-port. Forgot to mention that before :)

You should already have better than pvdm2-8 in the router, so enough dsp resource for the new channels.


Hope this helps, please rate post if it does!

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Paolo Bevilacqua Sun, 05/27/2007 - 17:27
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No other change is needed. As you are there you can issue some show isdn command to check on things and that's it.


pjscott13 Sun, 05/27/2007 - 17:42
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Thanks :-)

I just thought of another question. Can I just issue the new command without having to remove it first... as in without saying "no pri-group timeslots 1-10,16"?

Correct Answer
Paolo Bevilacqua Sun, 05/27/2007 - 17:51
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Actually you have to shutdown the corresponding voice-port, remove current with "no pri-group" first, then issue "pri-group timeslots 1-16". Then no shutdown the voice-port. Forgot to mention that before :)

You should already have better than pvdm2-8 in the router, so enough dsp resource for the new channels.


Hope this helps, please rate post if it does!

pjscott13 Sun, 05/27/2007 - 18:02
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Good point. Is there a way to check the pvdm etc?

Paolo Bevilacqua Sun, 05/27/2007 - 18:20
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Show diag. The number after dash basically indicates how many voice channel.

pjscott13 Sun, 05/27/2007 - 18:24
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Excellent. Slot 0 is 32 Channel and Slot 1 is 8 Channel. We already had 10 Channels and using Slot 0 anyway... so have plenty of room to move! Thanks. I will let you know how it goes and will rate once complete!

Paolo Bevilacqua Sun, 05/27/2007 - 19:10
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Good luck!


Please remember to rate all useful posts using the scrollbox below!

pjscott13 Mon, 05/28/2007 - 15:57
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Thanks for all your help. All worked ok. Though I did have a spot of bother. I just had to add the port back to "dial-peer". Once I found that out, everything worked!



Paolo Bevilacqua Mon, 05/28/2007 - 16:11
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Correct. On removal of pri-group, the voice-port disappears. It's hard to remember all the details sometime!

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