[USR-TC] L2TP with encryption

Hi, I'm trying to set up a tunnel L2TP with IPSEC between the HARC (LAC) and a router cisco (LNS). At first, I tried set up a tunel l2tp without ipsec. this part is working. Then I tried to add IPsec. On the simulation have the following error on the cisco : CRYPTO-4-RECVD_PKT_NOT_IPSEC: Rec'd packet not an IPSEC packet. I launched the monitor protocol L2TP on the HARC, the tunnel didn't establish. the router did not reply to the L2TP start session request. I didn't know which parameter a forget on the HARC. Is there a command to enable the IPSEC? I created the policy file and actived it, then i applied the policy file to an user. Thanks. Yannick