CallerID with umlauts / special letters

[Yealink_Daniel]

Dear Lorn10，

I have try to replicate this issue in yealink site, the issue doesn’t exist. My test scenario as below:
PBX: 3CX
Account name: “äöü” ( extension is 1001 ) T46G ( 28.73.0.45 )
Account name: “äöüäöü” ( extension is 1002 ) T38G ( 38.70.1.33 & 38.70.0.185 )
Account name: “äöüäöüäöü” ( extension is 1003 ) T32G ( 32.70.1.33 & 32.70.0.185 )
Make them call each other, the caller ID displayed at the phones are correct.

So could you please help to confirm with your service provider to check whether the caller ID module is correct ? Thank you advanced.
If the caller ID module is correct, please help to get a Correct Syslog, Config.bin and Trace.

How to get a Correct Syslog, Config.bin and Trace, please refer the FAQ below:
http://forum.yealink.com/forum/showthread.php?tid=1319

Best Regards