Maybe it's the "divert function of the phone" is enabled... try cancelling all the diverts.
Well, I added a divert to another number, to allow him to pick up his calls at all, and that works. Removing that divert gets us back to the same situation, all calls get a busy signal. Is this a known bug?
Im not pretty sure because i don't know what is installed in the phone. some third party apps can be used to send a busy signal to the caller. but im not in the position if you have installed one of those.
have you tried the option "cancel all divert" from the divert options?
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