Asterisk - The Open Source Telephony Project GIT-master-f36a736
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Caller ID names are currently 8 bit characters, propably ISO8859-1, depending on what your channel drivers handle.
IAX2 and SIP caller ID names are UTF8 On ISDN Caller ID names are 7 bit, Almost ASCII (See http://www.zytrax.com/tech/ia5.html )