BT freestyle 610 No dial tone

Hi,

I bought a BT freestyle 610 DECT phone from London 1.5 years back (2007) and brought it back to India.Recently I tried to set up the phone but I could not get any dial tone in the handsets.Base stations are powered up (connected to telephone outlet as well) and Handsets have registerd themselves.But when I try to turn the handsets on I do not hear any dial tone in any of the handsets.First I thought it to be an issue with the batteries but if the handset battery indicator is to be believed they are fully charged.Would appreciate any help in this matter.

Thanks and Regards
IRC