sundance-communications.com/forum Forums TDM Business Telephone Systems Nortel Telephones & Systems BCM DN Length

Hi
Presently i hav a BCM400 in Head office and 12 BCM50s in branch offices. Everywhere the DN Length is 3. In HO, the station numbers have no order, it can be 201, 302, 404 and so on. It was actually made by some old technicians. Now i have plan to implement site to site voip trunk. There are some DNs using in HO and also in branches.

I seek your advise, in such scenario, whats the best practice in numbering? What should/order i have give the HO and branches to be systemetic and no conflict?

If I do change my DN length everywhere, what are the consequences?

Any helpful comments are appreciated

What we have done is make one site start at 2221, the next site 3221, the next site 4221, If you have the random numbers from above, you will have a tough time setting up destination codes. I am not sure what will happen if you renumber. I have never done it after all the programming is done on a BCM.

I would recommend a 5 digit DN length for that many sites.

System programming will be unaffected by the change, but you will have to reinstall all of the voice mails.

Oh! there are two replies! I thought the email notification will alert me about the replies!

Emmit, thanks for your suggestion. If i start from 1221, 2221, 3221, 4221....9221, Then?! I have 12 branches i told.

5 digits are workable, but long for my (lazy) users! I personally prefer 4 digits. I want to know whats the standard and acceptable practice in DN numbering. I am sure, you will have answer for this.

Telemarv, Thanks for your suggestion too. Its nice to hear that my system programming will not be affected, including my voip configuration. You have an idea, from where i should change the digit length in BCM 400 and 50? Then i have to goto each dn and change the numbers accordingly?

Thank you verymuch for your support

Please understand this is a user forum. Specific programming instructions may not be discussed. The forum works on a what to do level not a how to. It definitely would be best to reinstall all sites to create a uniform dialing plan. Be certain you have all of your keycodes available.

When you increase DN length to an existing system, you will be adding a "2" to the front of the DN for a 4 digit DN or "22" to a 5 digit DN. Because the digit length change, all voice mail applications will have to be reinstalled.
Four digit will work. Dialing plan will look like this.

site 1: 2100 - 2199
site 2: 2200 - 2299
.
.
.
site 10 3100 - 3199
site 12 3300 - 3400

If you need more than 100 DN's at a site then assign 200 DN's to it and adjust the others.

Try to use as few different leading digits as possible as these will affect other access codes.

If you don't know how to do this. I strongly recommend you contact a certified BCM installer. This project is not for the faint of heart.

Then there is the whole subject of routes and destinations at each site. Which is way too complex to discuss here.

Thanks Marv. Honestly, i was in thought that its a technical solution forum. Sorry for asking an how to question.

I appreciate your help

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Thank you.

I have a couple of suggestions:

1) Probably you can try to use different authcode for different sites / destinations in which you have to use UDP plan.
2) Try to add a unique digit for every site before the existing DN of any number which would they allow you to use CDP plan.