S20 behind a FritzBox

I would like to connect my Yealink S20 via a SIP extension of the Fritzbox.

I only found a manual for MyPBX, which doesn't help me for a S20.

Incoming calls will work but outgoing calls will hang for a long time and then get the error "cause 18" in the display of the phone.

I have a working configuration with FreePBX and DrayTekIPBBX behind a FritzBox. So it should work with the S20 as well.


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