On Monday March 27 2017 19:15, you wrote to Alexey Vissarionov:
FR>>> 5.8. ISDN Capability Flags
AV>> Do anyone still use it?
AL> Yes.
But it is technology on the way out. Telcos are converting from POTS/ISDN to VOIP and very few offer ISDN emulation and if they do, it is seldom a complete emulation.