Hi everyone.

A user transfers all calls from his landline to his mobile phone. That's how he has been working for several years. He tells me it doesn't work anymore : "my mobile phone shows "call transfered" but I never receive the phone call".

I checked our TOIP portal if the call transfer is correctly set up : nothing has been modified. I try to transfer to another number : it works fine. I remove the SIM from the phone put it back again still NOK. I put the SIM card in another mobile phone, the call transfer is OK.

Now that I believe the phone is the issue, I reset the network parameters, check the APN settings. Still NOK. Not finding the solution I'm preparing to replace his phone but he's using his company mobile phone as a personal mobile phone so it's full of data so I try to find another solution.

I see that he has blocked more than 100 phone numbers (scam,...), a colleague looks into it and ask me to save as a contact his landline, we then find it in the list of blocked numbers...

Once unblocked the call transfer works perfectly fine again.