Question

Answer

If I now have direct dial, I need Caller ID Name/Number to screen my direct calls. What services can I use? 

Only ISDN (PRI or BRI) provides these features.

What do I need to use DID/BRI?

A compatible PBX such as an Iwatsu ECS IP-PBX. Other telephone systems are known to work but we have the most experience with Iwatsu. See us for a complete list.

Does the Iwatsu ECS IP-PBX only use ISDN BRI line.

No. The Iwatsu ECS IP-PBX uses any line sold by any US carrier (Verizon, USLEC, Cavalier, etc.)

Can only Infotel Systems /Iwatsu do this?

No. We just specialize in it. At least 5 other central Virginia dealers have offered the service.

I thought other telephone systems can also use ISDN BRI lines? 

Most can use ISDN BRI. Yet, they don't have the software to read the direct dial information required to properly route calls. To them, BRI is just a high quality digital line. Iwatsu provided the original test switch back in 1999 for development of this service.

What carriers handle offer DID/BRI?

 Verizon, Cavalier, and Telecove in the Virginia markets. Many more across the country.

If I purchase the Iwatsu IP-PBX with ISDN BRI lines, can I later convert to other types of telephone service?

Yes. But to preserve direct dial functionality, you would need to upgrade to a T1 or ISDN PRI. 

Who owns www.isdn.com?

We do. We are ISDN specialist. We consult all over the United States  regarding special ISDN applications.

What are the advantages to Centrex ISDN networking over IP networking?

It's a fully meshed network. Far more reliable. (see link)

How does the Iwatsu ECS IP-PBX differ from other IP telephone systems?

It can handle more trunk types and stations types that an IP only PBX. The Iwatsu ECS IP-PBX is the forth generation of a line of PBX platforms going back 18 years. The software was "ported" over to an entirely new OS in 2005.

Why have I not heard of DID/BRI?

DID/BRI is widely used in Europe and Japan for business applications. Iwatsu, a Japanese engineered PBX offers it here in the US. Carriers may not wish to discuss DID/BRI as it provides for lower telephone bills.

 Do digital telephone lines sound better? Aren't all telephone signals converted to analog anyway?

Your stereo speakers are certainly analog. But a digital CD sounds much better than analog cassette tape as a music source. Telephone systems work the same way. These lines will never hum, click, pop or hiss. It stays digital until it comes out the handset.

I thought ISDN BRI was old technology?

-ISDN: older than VOIP, younger than a T1. It's a proven technology.