VPN IPSEC between PFSense and Cisco Router

[dellpe]

Does everyone's ever built an IPSEC VPN between a PFSense  and a CISCO 1921 ?
If Yes, can you give me the way to configure it, even possible by the ASDM interface ?

On the PFSense Side, I think this Tuto is well explained :
http://doc.pfsense.org/index.php/IPsec_between_pfSense_and_Cisco_IOS

But for the CISCO 1901, I prefer to ask for somebody's help :)

Thanks in advance