ETSI TR 103 000-3-2 English Printed Edition English PDF Access and Terminals (AT); Analogue Access to Public Telephone Networks; Advisory Notes to Standards Harmonizing Terminal Interface; Part 3: Country Specific Advisory Notes: Sub-Part 2: ATAAB Advisory Note AN019 for the Czech Republic Network; DTMF signalling: tone and pause duration

standard published 08/01/2001 by European Telecommunications Standards Institute