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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.
https://www.tiptel.de/fileadmin/user_upload/tiptel_international/files/Yeastar/Manuals/configuration_of_the_tiptel_Yeastar_MyPBX_telephone_systems_behind_AVM_FRITZ_Box.pdf
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.
