Hi Imran

Now you are done with the config of the isdn dial out you need to create crypto config and need to apply the same under the dialer interface..

do refer the below link where the config are discussed and very much inline with your requirement...

you can refer the config of router light to complete the config at ur end..

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a008009475c.shtml

But also make sure that your headend(HO) router has also the same kinda config done..

regds