Thanks John and mainframe for keeping my hope alive on using magicjack with SX-50. I have not gone to the work last couple days but going to try it tomorrow morning and first use a phoneline polarity tester and connect it to magicjack to see what it shows and then go from there.
As far as RMATS module is concerned, i do not have that but if you can give me some hints on what commands and registers it effects maybe i can follow my extended manuals and Data Entry Tables to see if i can get some ideas how to proceed.

By the way mainframe, can you shed some light on connecting magicjack, like if you had to check polarity of the majicjack plug output, or if you had to do any changes in the pbx data entry tables.

Please let me know.

Thanks,

DP