The acronyms FXS and FXO are widely used terms in the analog telephony industry. FXS is an acronym for Foreign Exchange Subscriber and FXO is an acronym for Foreign Exchange Office. FXS and FXO are&hellip

The acronyms FXS and FXO are widely used terms in the analog telephony industry. FXS is an acronym for Foreign Exchange Subscriber and FXO is an acronym for Foreign Exchange Office. FXS and FXO are&hellip