VPN and nbn phone

[#1]

Hi we recently changed over to Optus nbn. Previous setup included a draytek router feeding internet to a Telstra modem . Phone line then plugged into Telstra modem. No problems.

switch to optus and same configuration, phone light will not come on, on the Optus modem. 

Draytek plugged in feeding the Optus modem, internet etc fine, have reset etc several times, still no phone light. Any ideas to get this phone working ?? Thanks

[#2]

I believe it needs to be switched around. Optus modem would feed internet into your router. Phone would also be plugged into Optus modem