Ordering PRI from Telco

Unanswered Question
Jun 17th, 2009


My customer is in the US and I am in the UK. My customer has asked me to help fill out the order form for the PRI, but coming from the UK I am unsure as to some of the questions being asked. The form is asking what "ISDN Protocol" is required, the options are "National 1", "National 2" & "Custom".

Another question was "DID Configuration" - TrunkPackage: Yes/No.

Can anyone please confirm what these options are and advise on what I should recommend.


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safety2008 Wed, 06/17/2009 - 09:36

ni2/national 2 is pretty standard. depends on CO/sentral office you will terminate in.I installed one last week that had to be 5ess although 4ess works in call manager. i would think they are asking you if these are going to be used in A DID scenerio and would need to know how many digits to send..

dhccoid.com Wed, 06/17/2009 - 22:36

Thanks for this Stanley.

I have noticed that the customer has ISDN Switch-type set to Primary-5ess and Primary-ni at some other locations, what would have been ordered from the Telco in order to have to have configured this?


safety2008 Fri, 06/19/2009 - 03:35

Sorry for delay, was out yest. Here in Boston where i am, my experience has found if its a long distance service alot of the CO'S are not ni2 compatable and require 5/4ess, with our local service with did's, we are ni2, i would config as ni2 and if theres problems with d-chan coming up, you can try the 5ess config.

Paolo Bevilacqua Fri, 06/19/2009 - 03:49

In reality, the difference between switch types is minor and obscure, whatever you get and whatever you configure, will work anyway.

safety2008 Fri, 06/19/2009 - 04:07

Just did one last week and d-channel would not come up until configuration was changed........so maybe for you..unless d-channel comes up...hows it work???????????

Paolo Bevilacqua Fri, 06/19/2009 - 04:11

Really d-chan should come up no matter what.

L2 is identical and L3 differences are just in corner cases that I dare anybody to document unequivocally from public sources.

safety2008 Fri, 06/19/2009 - 04:29

well configured as ni2, d-channel would not come up until configured as 4-ess...document vs reality i guess.


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