Copper trunks or ISDN-PRI (Local T1)?

Our company currently has a number of Verizon local copper trunks and DID lines arranged into a few trunk groups both through them and on our PBX. The total is around 23 in all. Do you think we would be better off dumping those and picking up a T1 ISDN-PRI line? What are the pros and cons of each? From what I can tell so far is that the cost will be close to the same either way. Any help deciding this would be helpful. I have been told that if we went with a Shoretel IP phone system the hardware cost would be less if we had the T1.
LVL 1
robw24Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

grbladesCommented:
The capabilities of the both are the same so it is really just a cost comparison.
A T1 interface for the new PBX is very likely to be cheaper than the 12 ISDN interfaces that you will need. 12 interfaces will probably mean you need 3 cards and that could limit future expandability.
You have to balance that against the install cost for the T1 and the difference in rental charges.
0
Robert Sutton JrSenior Network ManagerCommented:
If the cost is the same or close to it, then its easier to use the T1 PRI Vs. the ISDN.... There are alot of reasons to go this way but the most important would be scalability, and the difference in service between the two.
64k clear channel, and the simple fact that you wont need to maintain multiple cards(ISDN) for a single solution(T1) especially if the cost is comparable.
0
grbladesCommented:
I dont think you will get much more scalibility. An ISDN gives you 2 channels per line while T1 gives you 24. They are both effectivly the same (hence also known as ISDN2 and ISDN24). Scalability really comes down to what interfaces you have available.
I would expect a card to have a maximum of 4 connections per interface (mainly due to physical size) so ISDN2 will require multiple cards and you may reach the limit of the number of cards you can use. Using ISDN24 then you could just get a signle or quad T1 card which will give you plenty of expandability.

If you were starting fron scratch I would definetly recomend going the T1 route. As you already have ISDN2 though it really depends on how much the ISDN24 costs to install.
0
Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

robw24Author Commented:
Thanks for your quick responses. I think I may have confused the issue though. I was under the impression that a T1 was the same as an ISDN-PRI. I had previously called Verizon and asked them about getting a local T1 to replace our 13 regular copper trunks and 10 DID line trunk group. He came back with a quote for (1) ISDN-PRI port with (1) ISDN-PRI LDC and Calling Line ID. I thought this was just terminology for a T1. We already have a long-distance AT&T T1 line with 24 digital channels. I thought this would be similiar, not sure why Verizon is calling it ISDN.
0
Robert Sutton JrSenior Network ManagerCommented:
Its possible to deliver that (ISDN-PRI), but it would seem inappropriate for the solution needed if the "Cost" is close to being the same.

ISDN-BRI
ISDN-PRI

T1-PRI

Are all services offered by Telco...
0
robw24Author Commented:
Warlock, I'm not sure I understand your last post. Are you saying that a T1 is different than the ISDN-PRI solution and that I am better off with the T1? And a T1 is better than 23 regular trunk lines?
0
grbladesCommented:
T1 generally refers to a 1.5Mbps internet line which is normally delivered over an ISDN connection consisting of 24 *  64kbps channels.

ISDN2 = BRI (Basic Rate ISDN))
ISDN24 = T1 = PRI (Primary Rate ISDN) - typically used in the usa
ISDN30 = E1 = PRI - typically used in europe

Most telephone interface cards you get are labled as T1/E1/PRI
0
Robert Sutton JrSenior Network ManagerCommented:
Dependent upon how your service is delivered, YES they are different.

IE: Your quote from above:
And a T1 is better than 23 regular trunk lines? Again, depending on how the service is set up I would say yes....
Consider this:
23 "Reg. Trunk Lines" (Depending upon delivery method) is going to chew 23 ports SOMEwhere in your PBX or just before it.....
1- T1-PRI delives the same capacity in 1 port.
Hope this helps......
0
robw24Author Commented:
Yes that is what I am thinking, that a T1-PRI may be better because it only needs 1 port thus moving to a new phone systen may entail less costs upfront for less ports. A couple last related questions:

> Will our company be at a high or higher risk of losing phone access because if the T1 line goes down as opposed to all 23 individual lines?

> Could all incoming and outgoing calls using the new Verizon T1-PRi be re-routed automatically to our AT&T T1 which we normally use only for sales incoming 800# calls and long-distance outgoing calls?

Thanks
0
grbladesCommented:
Sorry for some reason I was thinking you were using ISDN2 and were thinking of switching to PRI.

In that case I would definetly advice you to switch to PRI. Some advantages are :-

Much quicker dialing - dont have to wait for a timeout on the phones and then wait again for the pbx to dial.
Better call progress - rather than hearing different tones you get informed about the status of the call. The PBX then knows if the line was busy, disconnected, unrecognised number etc...
Fewer problems balancing volume on the lines since its digital.
No echo generated your end to worry about (pure digital path through the pbx)
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
grbladesCommented:
> Will our company be at a high or higher risk of losing phone access because if the T1 line goes down as opposed to all 23 individual lines?

Probably depends how it is provided. I can only speak for the UK where it comes in via optical cable and then to a providers device which fives you the RJ45 PRI interface. No copper wires which can break so generally it is more reliable.

> Could all incoming and outgoing calls using the new Verizon T1-PRi be re-routed automatically to our AT&T T1 which we normally use only for sales incoming 800# calls and long-distance outgoing calls?

Sounds like all you need is switch the DDI range to the other line?
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Telecommunications

From novice to tech pro — start learning today.