Having recently switched to BE for my broadband I'm forced to use their crappy BE box rather than my trusty Draytek 2800 due to the well-publicised incompatibility between BE and the 2800 - I'm on the cheapo option so can't change the line profile or the INP values.

I'd like to use the VOIP ports on my now spare 2800 - effectively turning the 2800 into an ATA (analogue telephone adaptor), meaning that I can use the voip ports on the Draytek but route the calls out through the BE box.

I've tried configuring the second IP of the LAN port, disabling DHCP on the Draytek and connecting the two router's LAN ports together - effectively bridging the WAN and LAN sides of the Draytek. The Draytek works fine as a switch for the LAN, though there doesn't seem to be any way of changing the default route on the Draytek to be the BE box.

I've found a couple of threads about this - http://www.forum.draytek.co.uk/viewtopic.php?t=12932 and http://www.forum.draytek.co.uk/viewtopic.php?t=3669 being examples, though nobody seems to have solved it. I know the newer 2820 routers have a second WAN port that I could plug into the BE box, though I may as well buy a cheap ATA in this case.

Is there no way to configure a default route on the LAN for SIP calls? Adding a static route doesn't seem to work as 0.0.0.0 isn't considered 'valid'.

Is there a "Register Via.." option on the SIP setup, i.e. register via LAN or WAN setting ?

admin wrote: Is there a "Register Via.." option on the SIP setup, i.e. register via LAN or WAN setting ?

There is, though the problem is that the router doesn't 'know' how to route via the LAN to the other router. If the SIP server was on the LAN that it would work fine, the problem is changing the default route to be a LAN ip rather than using the Draytek's WAN connection.

Thanks

edit*

Sorry, model number fail

Oops, yes, good point, but maybe you can also set a static route to the outside world via the other router.