Reposted from the
Draytek UK support pages:
Setup for 'BeThere' or 'O2' (UK ISPs)
The Vigor 120 modem comes pre-configured for all ISPs apart from BeThere/O2 which uses unusual line settings (MPoA instead of PPPoA and different VPI/VCI settings). To configure the Vigor120 for BeThere, follow these instructions:
1. Connect the power adaptor to the Vigor 120 and turn it on.
2. Connect an Ethernet cable directly from a PC to the Vigor 120.
3. After a few moments, the PC should get an IP address (Most likely 192.168.2.10)
4. In your web browser, access the Vigor 120's web interface at http://192.168.2.1 (192.168.1.1 if you are using a Vigor100/220)
5. Go to the Internet Access menu and then click on the MPoA tab.
6. Check that the settings are correct (VPI 0 /VCI 101/1483 Bridged LLC)
7. You must now click the 'Enable' button on the MPoA tab.
8. If you wish, you can also set the modulation mode (e.g. ADSL2+) but this is not necessary, it just makes it re-connect quicker.
9. Do not select Annex M unless you definitely have that from your ISP.
10. If you are unsure, leave the modulation at AUTO.
11. Click OK and the Vigor 120 will save the settings and reboot.
12. Connect the ADSL line cable to the Vigor 120.
13. After a short while* your PC should then get a new IP address which will be the public IP address allocated by your ISP.
14. You can now access the Internet normally
*This short while can vary considerably when swapping devices on your line as BeThere take a while to 'forget' about your current equipment and access a new MAC address. This has been observed as up to an hour, but can also be minutes.