atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's Need a LOT of DIDs

I need 7000 DID numbers in all 50 states going into one call center. I contacted several providers of T1 lines, who all told me that it was more than they could handle. Who can I contact to provide these at a cost of 50 cents per DID number per month or so?

I was referred to Level3 or Global Crossing as wholesale providers of DIDs, but it is impossible to actually reach a human at either of those places.

Also, how many T1 or PRI lines would be required to handle that many DID numbers?

The quantity of T1/PRI's will be dependent upon how many simultaneous calls that are expected. Each T1 will give you 24 simultaneous calls, while a PRI will provide you with 23. Some systems (with the support of the service provider) can bond subsequent PRI's to the first one, meaning that the first one is the only one limited to 23 channels. The subsequent ones are allowed to use all 24 for voice traffic. I wouldn't count on that.

It's important to know what kind of existing phone system you have and what capabilities it has for such a dramatic expansion.

I've made a few calls to some contacts that I have with lots of standby services available. I'll post back if anyone can assist, but I think it is going to be a lot more expensive than that. There is the added cost of the delivery of the circuits to the premises which in this case would reach well into the five-figure range.

The question is, what are the traffic requirements? Are all of these did's going to be pointed at a single switch or forwarded to a single number that is pointed at the switch? Can your switch support 7000 unique did numbers? Your local carrier should have an enterprise sales group who can handle this.

Arc -

As the guys said - it depends on your traffic. For a small location, 10-15 Analog trunks per 100 DID numbers was considered decent service. Or 1 T-1 per 200 Numbers.

As you got bigger you got to take advantage of the added benefit that larger systems offered. Now Traffic models and Erlangs and all that good stuff start to apply..

You have to decide what grade of service you wish to provide and then you size your trunk groups accordingly.

When I managed the Network for the Bank of New York we had two buildings that each had 5000 DID lines and one that had 2000 lines. The two larger buildings each had 8 T-1s for DIDs. The smaller had 3 or 4. I don't remember ever seeing an ATB (All Trunks Busy) on any of my DID Trunk Groups.

If you can give me a better idea of what your network layout would look like I might be able to dredge up some ideas for you.

Sam

Have you considered one or more National 800 numbers to handle all 50 states? Depending on what you are actually doing, it would be cheaper and easier to manage than so many DID’s.

My customer already has an 800 number, but wants local numbers all over the US. I found one outfit that was willing to provide several hundred DiDs but not several thousand. I need a carrier that can think big.

Are you looking at maybe a DID for each area code? If so, you are probably not going to be able to find a company that can do it. If was just a number from a state, then it would have to be a company that is ON NET in all 50 states to be able to send calls at next to nothing cost. I remember Time Warner had something to that effect. For example if you had two sites that were using Time Warner and both were ON NET, you could call each site for free.

I am looking for seven thousand (7000) DiD numbers. That far exceeds the number of area codes. My customer wants at least one number in each local calling area in the USA so anyone in the entire USA can call him by making a local call. I know a lot of ISPs have a setup like this, so it must be possible.

I have already heard back from a number of carriers who say they can do this. I was wondering if anyone has any experience in setting up such a large inward-bound network and what they could tell me.

I have few customers who is in Locksmith business and they have lots of DIDs but only from 5 Boroughs of NY city but not from different states. The only I can only think of AT&T, Verizon and maybe Sprint but not other carriers.

PM sent.