DIN ETS 300139 : 1992
DIN ETS 300139 : 19921472453
DIN ETS 300139 : 1992
Title: Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; service description; english version ETS 300139:1992
Year: 1992
Publisher: DIN Media GmbH
Availability: Within 1-2 working days
Title: Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; service description; english version ETS 300139:1992
Year: 1992
Publisher: DIN Media GmbH
Availability: Within 1-2 working days
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