| I had pretty much let this thread go since bobcheese's answer was absolutely correct, but I keep running into something else that causing problems with this, so you need to be careful doing this... let me explain.
The Mitel 3300 (and most other phone systems) can and will handle this gracefully, this is absolutely true and works perfectly with a traditional TDM ISDN PRI service.
The problem is a lot of carriers (around here anyway) are now delivering PRI service from a IP type service, such as SIP, via a Cisco or Adtran router. Dial-up data services like modems, credit card authorizing units, and faxes will often fail to work, fail intermittently, or are just extremely slow on this type of service and it has nothing to do with the Mitel or whatever phone system they are connected to.
These are usually easy to spot, from one to four T-1 circuits will terminate into a Cisco or Adtran router, and from that there is usually an Ethernet connection for Internet and a T-1/PRI connection for the phone system. Sometimes these will have analog lines off them as well. We also see at least one wireless Internet provider putting up antennas and feeding these units with direct IP and converting a SIP service from an Asterisk based system to PRI for customers.
For voice this type of service usually works out OK, but for dial-up data services it can be trouble. __________________
Telephony users cannot gain anything without first giving something in return. To obtain a useful feature, a feature of equal value must be lost.
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