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On the enterprise side, besides migrating to VoIP system, some of the clients still want to keep the analog terminals for some emergency critical scenarios, such as analog elevator emergency buttons, fire alarms, and call boxes, which need PSTN for emergency failover.


5. FXO port for PSTN connection when the internet and power fail, emergency lifeline ability guaranteed.
* ISDN PRI - AT&T GTA (attgtadirect.com)
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