Fortinet as remote VPN Client to Cisco ASA.

Hi Guys

Need some help, My company will configure Fortigate Cisco ASA VPN, but Fortigate will act as a remote VPN client that will connect to Cisco ASA 5520. I have an existing working VPN to SITE1 but with another Fortigate Firewall, in this case I would like to connect it to Cisco ASA (same Phase 2). I have only have WAN1 interface to connect to the Internet via DSL, How can I make that two VPN on the same WAN interface? I Already configured another VPN Phase1 for Site2 but it doesn't go UP. 

I have link below for the current settings of our FortiWifi 60C (v5.0)

https://drive.google.com/open?id=0B4JKP8NFHNCYQTVNbEpGZmlGOFU

EXISTING:

REMOTE SITE                                                                                 SITE1    

[FortiWiFi 60C (WAN1) ]---------Remote VPN acess--((INTERNET))----->[FORIGATE 111C]

PROPOSED:

REMOTE SITE                                                                                 SITE1

[FortiWiFi 60C (WAN1) ]---------Remote VPN acess--((INTERNET))----->[FORIGATE 111C]

                          |

                          |                                                                         SITE2 

                          |--------------Remote VPN acess--((INTERNET))----->[Cisco ASA 55520]

[size="2"]*VPN for SITE2 is interface DOWN it also binded of WAN1.[/size]

==================================================

CISCO ASA5520 Settings:

Tunnel-group

tunnel-group VPNClient type remote-access

tunnel-group VPNClient general-attributes address-pool pool.webvpnnetwork authentication-server-group NTAuth LOCAL default-group-policy policy.vpnclient tunnel-group VPNClient ipsec-attributes pre-shared-key ***** isakmp keepalive threshold 10 retry 2 tunnel-group VPNClient ppp-attributes authentication ms-chap-v2

Hope you could help me with this. Thanks!!.. :)