Ok!, here I send the configuration in both sides of the VPN:
PIX Firewall
access-list 20 permit tcp host <remote public IP> host <local public IP> eq telnet
access-list vpn-name permit ip host <local public IP> host <remote public IP>
crypto ipsec transform-set strong esp-des esp-md5-hmac
crypto map NAME 3 ipsec-isakmp
crypto map NAME 3 match address vpn-name
crypto map NAME 3 set peer <remote peer>
crypto map NAME 3 set transform-set strong
crypto map NAME 3 set security-association lifetime seconds 86400
crypto map NAME interface outside
isakmp enable outside
isakmp key ######## address <remote peer> netmask 255.255.255.255
isakmp identity address
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption des
isakmp policy 10 hash md5
isakmp policy 10 group 1
isakmp policy 10 lifetime 86400
SonicWALL
Security Association: NAME
IPSec Keying Mode: IKE using Preshared Secret
Name: NAME
IPSec Gateway Address: <remote peer - PIX Firewall>
Phase 1 DH Group: Group 1
SA Life time (secs): 86000
Phase 1 Encryp/Auth.: DES & MD5
Phase 2 Encryp/Auth.: Encrypt for CheckPoint (ESP DES HMAC MD5)
Shared Secret: ###########
Specify destination networks below
Network: Subnet Mask:
x.x.x.x 255.255.255.0
Thanks again!
R.a.M.