Hi Perigrine,
If I recall correctly, the Technicolor modems no longer support DECT pairing to the T-Hub phones. If you wish to use a T-Hub with your T-Gateway, you would connect the base station to the green port on the back of the modem and pair the handset back to it's own base station.
Alternatively, if your phone service is supplied via the UNI-V port, you would connect the phone cable from the base station to that port.
If you need further assistance with this, please contact Tech Support on: 1800 834 273
- Shelly