. . . . . . . . . "42869537"^^ . . "635376956"^^ . "Emergency Stand Alone (ESA) is a term used by the vendors of telephone equipment such as Nortel DMS-100, Lucent 5ESS or GTD-5. Typically, small towns or communities have telephone services provided from a \"remote switching unit\" which is controlled by the more powerful host switching complex. ESA occurs when the host/remote links are severed, thus leaving the region in \u201Ccommunity isolation\u201D. While in the ESA mode, the town/community is limited to only receiving or placing calls within that community/town. \n* v \n* t \n* e"@en . . "994"^^ . . "Emergency Stand Alone"@en . "Emergency Stand Alone (ESA) is a term used by the vendors of telephone equipment such as Nortel DMS-100, Lucent 5ESS or GTD-5. Typically, small towns or communities have telephone services provided from a \"remote switching unit\" which is controlled by the more powerful host switching complex. ESA occurs when the host/remote links are severed, thus leaving the region in \u201Ccommunity isolation\u201D. While in the ESA mode, the town/community is limited to only receiving or placing calls within that community/town. Larger towns/regions may have several remote switching units which required \u201Cbackdoor trunking\u201D to connect all remote units during ESA within the same town/community. Special translations can be implemented to allow 911 to be redirected to a local number such as the local police station or fire hall that resides within that same community/town. \n* v \n* t \n* e"@en . . .