> I am interested in knowing if there is any standardisation in the connection > between a telephone handset and the telephone.
You can buy the cord that connects the handset to the base of a telephone in any telephone store, so to that extent there is a defacto standard, without that being part of the North American telephone standard (TIA/EIA/ANSI-473 ??) Different manufacturers may use the same microphones and receivers, but those are not necessarily standards. There is a standard on the acoustic output of the receiver for a given electrical or digital stimulus and there is a standard for what the electrical or digital output should be for a given acoustic input. (There is more to it than that, but I won't go into it here). There are many proprietary telephones used behind PBXs that also meet those standards but, in eihter case, HOW they do it was never considered an appropriate field of standardization. Buy a copy of the TIA Standard and you may discover as I did many years ago that there is much more to a plain old black telephone, than meets the eye. Ciao, Vic
