German Umlaute not properly displayed

[Jörg von der Ohe]

May someone has an idea what could cause the problem. We are facing the problem the german Umlaute are not displayed correctly when we call a user on our Avaya PBX. It seems the wrong charakter is already send in the invite to the gateway, which is a Ferrarie Office Master Gateway. 

On the Avaya side it looks like (see attached Screenshot).

[#2]

Hi Jörg.

If you dump the SIP stack trace from the SBC, where you see both "sides", you should be able to see what is sent in the from field.

I know various other hardphone variants having a problem interpretating various "non-standard" letters, like umlauts and scandinavian letters, where the problem was SIP invite is in UTF-8 but device was using another character encoding standard.

/Kenneth ML