[cisco-voip] Best Practices

[Ed Leatherman]

Hi Gary,

I think its a good idea to get 10 digits from the LEC, then you alway have
more numbers to work with. At that point you could take more than 3 digits
as significant and process them through a translation pattern to get them to
the extension you want.

For example, if the called number from LEC is XXX-593-3183, take 4 digits as
significant and have a 3XXX translation pattern intercept the calls from
your gateway and pass them to the correct partition/phone. You could have a
4XXX pattern catch calls to 593-4183 etc. If you still run into problems you
could take more sig digits and make the pattern more specific to the
telephon exchange or something.

Is there a requirement that you can only have significant digits set to 3?

Hope that helps/makes sense on monday morning.

On 9/17/06, Gary L. Pate <gpate at kenttech.com> wrote:
>
>  I'm trying to determine a "best practices" when setting up inbound DID's,
> extensions, etc. Let me explain:
>
>
>
> In most situations I've been involved in, I've used the last 4 digits of a
> DID as someone's extension. I make sure the LEC sends 10 digit's, and I do a
> significant digits of 4 on the gateway. This has always worked well, and is
> easy to configure. However, in a recent install, this customer was using 3
> digit extensions, so I again had the LEC send 10 digits, and I made the
> gateway significant digits of 3. Again, this worked, but the problem was
> that I started running into to many situations where I had duplicate 3
> digits. For example, a DID might be 593-3183, so the phone extension was
> 183. But I also had a existing fax line number that was 444-4183. As you can
> see, the last 3 digits are the same. I could not make a translation pattern
> of 444183 because the gateway was only sending 3 digits. I ended up having
> the LEC forward the 4444183 to one of the DID ranges, and then gave the fax
> the number from that range, but that is not what I want to do in the future.
>
>
> I guess what I want to know is what is the "best practice" going forward?
> Is it a good idea to have the LEC send 10 digits, and if so, what should I
> set on the gateway for significant digit's, and how should I handle my
> internal phones that are using the last four digits of the DID as their
> extension? I've read a document on using translation patterns to prefix
> digits, etc, but I'm not sure if that is the directions I should go.
>
> Can someone offer advice on this, and perhaps provide an example of how to
> do this with both a 4 digit example, and a 3 digit example? I really want to
> have more control over the lines, and not have to worry much about duplicate
> numbers or having the LEC getting involved.
>
>
>
> Gary
>
-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University
Telecommunications and Network Operations
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