Ascom IP-DECT
From Zenitel Wiki
Load factory default by pressing the reset button through the hole at the rear for 10 sec.
The Ethernet port is by default set to automatically obtain an IP address (DHCP). In your browser, enter ipbs-xx-xx-xx, where xxxxx is the last six digits of the MAC address found at the rear of the IP Dect unit.
192.168.0.1