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Method of providing centrex type operation using a PBX and a central switching office

  • US 5,949,873 A
  • Filed: 04/07/1997
  • Issued: 09/07/1999
  • Est. Priority Date: 04/07/1997
  • Status: Expired due to Term
First Claim
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1. A method of operating a communication switching system in conjunction with a PBX comprising:

  • (a) storing at the PBX equipment station identifiers in association with directory numbers,(b) storing at the switching system said station identifiers in conjunction with said directory numbers and a PBX identifier,(c) in the event of a station connected to the PBX going offhook, looking up at the PBX a station identifier associated with a directory number assigned to the offhook station,(d) transmitting the looked up station identifier to the switching system, and(e) upon receiving the transmitted station identifier at the switching system, looking up the corresponding directory number, and changing characteristics of a line between the switching system and the PBX over which communication is to take place, to suit predetermined characteristics based on the corresponding directory number.

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