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SXGA - Two way DID trunks usually require ISDN PRI for connection..Not all PBXscan support ISDN PRI (modern ones do but older switches made in theearly 80s, etc cannot) ... analog DID trunks usually are only oneway ... and require the PBX to have outbound CO trunks for callingout ... PRI because of its digital nature and permanent signaling in theD Channel allows two way service on the same trunk.Chrislifeson@earthlink.net wrote: DID is confusing me. I know it can be configured on either 2-way or 1-way (incoming). But the majority is in-bound only. Why not buy 2-way DID trunks exclusively? If they want DID, then why buy one way, in-bound only DID? I do not understand -- is it cheaper? I mean, if the incoming calls are via the DID, then they are not handled by the 2-way trunks, and it seems they are wasting 50% of those lines (the incoming call capability). Can someone explain why you might want to buy in-bound only DID trunks instead of 2-way? TIA
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