DID's come in two flavors, analog and digital. Analog DID comes from your phone company and come in on their RJ21 blocks. For these to work with the Norstar you need a DID card. These cards install in any trunk module.
Digital DID's come in over a PRI circuit. The Norstar needs a T1 card to make use of these kinds of DID's
All DID's only allow inbound access (hence the name...Direct Inward Dial). To use these in the Norstar you need to program target lines...Hope this helps.
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