All phones give a busy signal when i try to call & no calls come in
I assumed when you say all phones are operating means there's power and are charging.
1. There could be some phones that are loading the Tel line. Disconnect all phones and plug it one by one while checking the dial tone. If all phones gives busy tone, there coulb be a problem in the Trunk line or the Tel Company line.
2. There could be a short or resistance in the line. Check the connection in junction box between your house and the Tel Company cable.
3. If you have an analog Tel set, you can check the dial tone directly from Tel Company cable that comes in to your house.
I hope this helps.
Best Regards.
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