Elec, phys, procedural, protocol reqs for V i/f betw Access n/w and LE for support of analogue telephone - ISDN br with line txn i/f or u-n i/f @ user side - with flexible info chan (B chan) allocation during pro-visioning, without concentration in access n/w. Permanent leased ccts &c bypassing LE excluded. Ax n/w or implementation not included.