The other poster hasn't read the 2820 spec, its better than the older Draytek models that couldn't do this.
That is correct - I had not read that bit of it.
My new 2820 is not a VoIP variant. And my old 2600VG is not that clever.
Line One:- Zen - DrayTek Vigor 2600VG
Line Two:- EntaNet (Aquiss) - DrayTek Vigor 2600