My home network is connected to the office via a VPN, but in order to reach the office network it is necessary to add a route to each home PC (e.g. route add 10.10.10.0 MASK 255.255.255.0 GATEWAY_IP). Is there a way to add an entry to the E90 route table???
(The reason I have to do this is that the VPN gateway is not the usual gateway, and the router's static route assignment appears not to get pushed to devices properly).
The VPN gateway is not the usual gateway ? - does that mean you have a gateway for the internet (like an ADSL modem) AND a second VPN router connected to a separate physical connection ?
If you have a combined ADSL router and VPN gateway like a Cisco 871, you should be able to use it's inside interface IP as the gateway and route traffic correctly.
If you have two separate devices, you need to use one of them as a gateway AND this device must be able to accept route tables that send inbound traffic to the other gateway/modem.
Say, if the inside IP of your ADSL router is 192.168.1.1 and the inside IP of your VPN router is 192.168.1.2, you might be able to configure a route table on the ADSL router saying: 10.10.10.0 MASK 255.255.25.0 192.168.1.2 1 (Cisco syntax if I remember correctly).
I have done this on a customer site where they did have two physical lines, one for internet and one routed directly to a remote site.
If the above fails, you might need to put in an extra router between your gateway(s) and your network.
Normally you would set up static routes from your gateway to your vpn gateway.
If you directly type and IP the phone will simply "ask" the gateway who will route appropriately. The phone shouldn't need your routers or ga for the address and its up to that to forward incoming and outgoing packets down the right route.