Strange one this. I have a panasonic digital cordless phone and noticed when I was dialing numbers I was getting the above error. When i tried the same number on the mobile it was fine. I also have a older bt type phone on an extension and when i dialed a number that was fine. I phoned BT and did numerous tests but they could not find a problem on the adsl copper based land line. I decided to change the Panasonic phone for a new model but it made no difference. Sometimes it works on numbers and other times I get the error message. I have also contacted panasonic support to no avail. I also have broadband fibre 2 on the same connection connected via a master socket SC that was newly installed by BT as i was getting a much slower broadband speed than advertised which did cure that problem. I have tried disconnecting the extension phone but made no difference.
Oh yes sometimes when I dial a number it does work. Any ideas?
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Just to clarify; does this happen when you literally dial the number using the keypad, when using abbreviated dialling or when calling someone in your contact list?
I power cycled the base station, which then seem to allow to dial out without the error. I do not expect this to fix the problem completely, as it appears intermittent. I will persevere.