Toshiba CTX28 dialing tone

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Dear all
I am Ali from Lebanon
I have bought a CTX28 telephone system from Texas USA from many years and i was
install it in my office, it work properly there.
Since 6 month i was came to my country Lebanon for a new job, the phone system
do not work here, it can receive call and hear caller but cannot dial or talk
I guest is the difference between systems but cannot found any solution.
Anyone have a solution please tell me:

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