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pptp vpn not working (router 2911)


I am working in GULF and skype and other free voice services are blocked. people sometimes use vpn(ivacy or unblock) on iphone/pc. At office we have only 2911 router and no firewal and simple NAT is done on ADSL interface. i read that for pptp, tcp 1723 and gre protocol 47 should be opened. i did the following configuration changes but it is still not working and am getting the error "The VPN connection between your computer and the VPN server could not be completed. The most common cause for this failure is that at least one Internet device (for example, a firewall or a router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) protocol packets". any suggestions what command should be entered to bypass pptp. while at home i am using linksys and bypassed the pptp (see the image)

ip nat inside source list 101 interface Dialer1 overload
access-list 101 permit tcp any any eq 1723
access-list 101 permit gre any any
access-list 101 permit ip any any

Router#sh access-lists
Extended IP access list 101
    10 permit tcp any any eq 1723 (2 matches)
    20 permit gre any any
    30 permit ip any any (3474 matches)



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