How to setup bridge mode?

Folks


I have BT Max ADSL a FritzBox 7140 VOIP router and a 2Wire 2700 HGV (aka BT Business Hub) router.

On my long line the 2wire router syncs @ 1900, much faster than the FritzBox (@ 800-900). This makes
a considerable difference to the download speed.

But I need the VOIP functionalty in the FritzBox.


Ideally what I would like to do is to use the 2Wire as a "dumb" modem, and the fritzbox as the NAT
router and VOIP box. And for the PC's on the network to use DHCP as normal.
But I dont understand how to do that.


My current understanding is that I can do this by placing the 2Wire in to "bridge" mode
Is that correct? (I am not sure what bridge mode is...)

When I select bridge mode the 2Wire wants me to enter an IP submask - what should I put in here?
Should I disable the 2Wire DHCP server?

I can disable the FritzBox DSL modem and get to to connect via the LAN1 port to the 2Wire.
Should I specify the FritzBox IP address? Or use DHCP? (which server - the 2Wire?)
What should the default gateway be?


Any pointers gratefully received....