Integrated Services Digital Network (ISDN); Public Switched Telephone Network (PSTN); Premium Rate (PRM) service; Service description
STANDARD published on 14.3.1997
Designation standards: ETSI ETS 300712-ed.1
Publication date standards: 14.3.1997
The number of pages: 23
Approximate weight : 69 g (0.15 lbs)
Country: European technical standard
Category: Technical standards ETSI