• ETSI ETR 191
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ETSI ETR 191

  • Private Telecommunication Network (PTN); PTN mobility; Use of Universal Personal Telecommunication (UPT) Phase 1; General principles and service aspects
  • standard by European Telecommunications Standards Institute, 09/01/1995
  • Publisher: ETSI

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To identify and describe the requirements on PTNXs/PABXs and UPT phase 1 to support UPT users at PABX (PTNX) extensions. Applicable to both the analogue and ISDN environments.

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