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My panasonic key phone system KX-T7750 cannot call out, anyone can assist?

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My panasonic key phone system KX-T7750 cannot call out, anyone can assist?

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  1. when you lift the handset then press outside line button do you have dail-tone? if you do not have dail-tone you should get in touch with the company that installed the phone system for you. and ask them to come out and look at the system.

    good luck E.

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