IPSEC trough Hotspot

I try to establish an IPSEC VPN connection over an MT Hotspot (authenticate myself in a browser, and try to start my Ciso VPN client). It seems that MT does not pass trough the VPN traffic (over normal MT router without hotspot it works well, even if NAT is used).
How can I configure my MT hotspot to pass trough the IPSEC VPN traffic?