When I try to display CallerID names with German Umlauts (Ã¤Ã¶Ã¼ Ã„Ã–Ãœ ÃŸ) in different phones (Thomson ST2030, X-Lite Softphone) Iconv didn't help me. While I can change the charset with Iconv, the phones show Umlauts as "%e4%f6" or the like. In fact they display the hex code for the appropriate UTF-8 encoding.
I guess it is because the SIP messages are always UTF-8 encoded. Does someone have an idea how to make * send the CALLERID(name) in the SIP message with a different charset?