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I keep getting the message “isdn_tty: call from XXX – YYY ignored”. Why does isdn4linux (syncPPP) ignore this dialin attempt?

April 26, 2017attempt dialin isdn4linux message syncppp

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I keep getting the message “isdn_tty: call from XXX – YYY ignored”. Why does isdn4linux (syncPPP) ignore this dialin attempt?

1 Answer

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There are two possible explanations. Either your own MSN (here: YYY) is not correctly set with “isdnctrl eaz interface YYY”. Or “isdnctrl secure interface on” was set, without allowing calls from the incoming number (here: XXX) with “isdnctrl addphone interface in XXX”.