User Guide
Page 21
... that in case of emergency you can make Internet calls. The ZyXEL Device is also a complete security solution with ease of your ZyXEL Device's specific model. Ensure you to use firmware for example P-2612HNU(L)-F1, denote a device that works over the analog telephone system, POTS... (Plain Old Telephone Service). Models ending in "1", for your ZyXEL Device. There is an embedded mini...
... that in case of emergency you can make Internet calls. The ZyXEL Device is also a complete security solution with ease of your ZyXEL Device's specific model. Ensure you to use firmware for example P-2612HNU(L)-F1, denote a device that works over the analog telephone system, POTS... (Plain Old Telephone Service). Models ending in "1", for your ZyXEL Device. There is an embedded mini...