Hi p2pvoice,
The Draytek 2910V is a Full Cone Nat Router (I believe). I've configured the HT386 behind various routers ok. I've used both the STUN and Outbound Proxy methods depending on the VSP.
I thought Voxalot handled symmetric Nat? Try setting up the Outbound Proxy settings and turn STUN off... Also turn off DNS SRV if you have it on and see if that works.
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