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DIN ETS 300191
1993
Private Telecommunication Network (PTN); signalling protocol at the S-reference point; identification supplementary services; English version ETS 300191:1992
- Format:
- Language(s) :
- Published :
- English
- 09/01/1993
Private Telecommunication Network (PTN); signalling protocol at the S-reference point; identification supplementary services; English version ETS 300191:1992
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