As perviously covered here before, no hacks for any panasonic model  You need to make a physical modification to the machine via a third party hardware unit (if you did not buy it pre-modified from a specailist dealer).
A google search for your model and a modification, or clicking the banner at the bottom of these forums will provide further info.
There is no "built in" handset hack for any panasonic model, new or old.
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Main System : PDP-LX508D, B&W XT4s / XTC, PV1, SR8002, DV9600, DMP-BD10 MR, HD-EP35, Sky HD 1TB, Dreambox & 1.2m Dish, RDR-HX1000 MR, S-21T HTPC
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