How to setup the VPN tunnels for ERT-805?

ERT-805 can easily build the 3DES IPSEC VPN tunnels through the following settings.
The example below is using a pair of ERT-805s as the example.
However, to setup it with 3rd VPN devices it is about the same!
VPN 3DEC connection to two ERT-805

*** Router 1
ERT805_1# sh ru
Building configuration ...
service password-encryption
service timestamps debug
!
hostname ERT805_1
!
enable password 7 GlkYmBAtKRonWBA
enable password 7 vdWT4hsDwZwpgHC
!
crypto ipsec transform-set TO805 esp-3des esp-md5-hmac
description To805
mode tunnel
initialization-vector size 8
!
crypto map MAP1 1 ipsec-isakmp
description To805
set transform-set TO805
set peer 10.0.0.2
match address 100
!
crypto isakmp policy 1
authentication pre-share
encryption 3des
group 1
hash md5
!
crypto isakmp key 12345678 address 10.0.0.2 255.255.255.252
!
interface fastethernet 0/0
ip address 192.168.0.254 255.255.255.0
!
interface serial 0/0
encapsulation ppp
ip address 10.0.0.1 255.255.255.252
crypto map MAP1
!
interface async 0/0
!
router rip
version 2
network 192.168.0.0
network 10.0.0.0
!
line vty 0 31
!
access-list 100 permit ip 192.168.0.0 0.0.0.255 192.168.1.0 0.0.0.255
!
end

*** Router 2
ERT805_2# sh ru
Building configuration ...
service password-encryption
service timestamps debug
!
hostname ERT805_2
!
enable password 7 q61Y2QVE6ELyzuB
!
crypto ipsec transform-set TO805 esp-3des esp-md5-hmac
description To805
mode tunnel
initialization-vector size 8
!
crypto map MAP1 1 ipsec-isakmp
description ToERT805
set transform-set TO805
set peer 10.0.0.1
match address 100
!
crypto isakmp policy 1
authentication pre-share
encryption 3des
group 1
hash md5
!
crypto isakmp key 12345678 address 10.0.0.1 255.255.255.252
!
interface fastethernet 0/0
ip address 192.168.1.254 255.255.255.0
!
interface serial 0/0
encapsulation ppp
ip address 10.0.0.2 255.255.255.252
crypto map MAP1
clockrate 2048000
!
interface async 0/0
!
router rip
version 2
network 192.168.1.0
network 10.0.0.0
!
line vty 0 31
!
access-list 100 permit ip 192.168.1.0 0.0.0.255 192.168.0.0 0.0.0.255
!
end