Can someone provide me a link on the format of the display-names used
in the FROM and TO headers.

Hi, RFC3261, section 25

My question is, are the following display names permitted?

From: some;one <sip:[EMAIL PROTECTED]> or
From: some,one <sip:[EMAIL PROTECTED]>


and also

From: some?one <sip:[EMAIL PROTECTED]> or
From: [EMAIL PROTECTED] <sip:[EMAIL PROTECTED]> or
From: some:one <sip:[EMAIL PROTECTED]>

the rule for the format of the display name is

display-name = *(token LWS)/quoted-string

The examples you presented all contain separators, which are not allowed. A token is

token = 1*(alphanum/"-"/"."/"!"/"%"/"*"/"_"/"+"/"`"/"'"/"~")

You can use separators (and a wide range of other characters) if you
enclose the display name in double quotes (quoted string).
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