| model name | description | filename |
| Handbuch | release notes of all releases incl. v3.03 | ot_e301.txt readme.txt |
| Software | ZyXEL ISDN Konfigurations Manager
v3.24.de ZyXEL ISDN Konfigurations Manager v3.27.de Configuration-Manager for Apple |
ZyICM324.de.zip ZyICM327.de.zip Config-Manager_v2.04 |
| OT_E OT_G |
Firmware EuroISDN "DSS1"
v3.02 Firmware EuroISDN "DSS1" v3.03 Firmware German "1TR6" v3.00 |
ot_e302.zip ot_e303.zip ot_g300.zip |
| Drivers | Driver for Windows 9x/NT5 (W2K) Driver for Windows NT 4.x |
mdmzyxot.zip mdmzyxot.zip |
| Tips zu ISDN-TAs | AT$ Omni TA128 | MDMZyx |