The Zoom 5801 answers a market need for ATA 911 compliance - to a degree. This ATA has a POTS (FXO) connection in addition to the phone connection (FXS). This POTS connection can be engaged by the dialplan set in the ATA, a loss of the VOIP server as well as dialing a special code. So if I deploy these, based on the config file in the ATA, I can set the 911 to use the POTS line, the VOIP line or the pots as a backup to the voip line and I believe the VOIP line in backup to the POTS line for emergency numbers.
Having an FXO port makes you want to use it for Asterisk! Well it can to a point. You can have the ATA act as a single line SIP FXO port (in and out) or an ATA, but not concurrently - at this time. Read on.
