ramblings

Troy and the Draytek 2820Vn

by on Aug.15, 2009, under Networking, VoIP

The Draytek 2820Vn is a great device for home and small-offices. It has two WAN ports; ADSL and Ethernet. Excellent VPN capabilities 32 simultaneous VPN tunnels (IPSec, PPTP, L2TP and L2TP over IPSec.)

In order to get point to point voice working either on VPN or LAN you need to ensure that

  1. the “External IP :” under VoIP -> SIP Accounts is the private IP of the router itself
  2. the SIP account in use is configured with  “Register via  LAN/VPN”
  3. “NAT Traversal Support” is set to “None”

Troy was trying in vain to get voice calls working. We hit on this combination after quite a bit of messing the parameters. The predecessor of the Draytek 2820Vn (the Draytek 2800VG) does not need these fiddly parameters configured and works just fine without these settings. This coupled with the fact that he’s bought 5 of these devices to internetwork the branch offices of a relative’s company, caused this networking boffin a lot of frustration.

Troy has since gone back to meddling with his favourites Cisco and HP ProCurve, thankful to your truly for having helped put this ordeal behind him!

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