Cisco 801 Filtering IPsec

[Si2k]

Hi All,

Currently i use 2Mb ADSL and a SonicWALL VPN TELE3 to access our corporate application server in the datacentre.

If our ADSL breaks i'd like to use our ISDN line. SO, i bough a CISCO 801 ISDN router, slapped it on the line, configured it, and it dials on to the internet fine.

However it seems to be filtering all VPN transmissions because it will not allow me to communicate with the server over ISDN.

I think that it should be "transparent" to VPN transmisisons but i do not know how to do this.

Please help me out here.

Thanks

Simon J