Centralised call answering arrangements not requiring operator intervention

Full Title

Automatic or semi-automatic exchanges > Systems providing special services or facilities to subscribers (specially adapted for wireless communication networks H04W4/00) > Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers (H04M3/487 takes precedence; centralised dictation systems H04M11/10); > Centralised call answering arrangements not requiring operator intervention