DIN ETS 300143/A1 : 1996 Title: Integrated Services Digital Network (ISDN) - Audiovisual services - Inband signalling procedures for audiovisual terminals using digital channels up to 2048 kbit/s; English version ETS 300143:1994/A1:1996 Year: 1996 Publisher: DIN Media GmbH Availability: Within 1-2 working days