[Asterisk-Dev] IAX spec: Text formats and character sets

[Tzafrir Cohen]

On Thu, Apr 28, 2005 at 05:15:34PM +0200, Olle E. Johansson wrote:
> Steve Underwood wrote:
> >Hi,
> >
> >I raised this with Mark ages ago, when I started putting Chinese into 
> >IAX2 messages. I thought it should be specified that all text is Unicode 
> >in UTF-8 form, but he seemed pretty indifferent to specifying anything.
> >
> >There is no need to have ASCII + UTF-8. ASCII is a subset of UTF-8, so 
> >they are fully compatible. Its only when you have 8 bit sets, like the 
> >PC ones, that compatibility is an issue. Just define that all strings in 
> >IAX2 are UTF-8, and that is the end of it.
> >
> ...yes, I'll admit that is an easy way out. But we still need to handle
> conversion to ISO8859-1 caller ID's 

Where is ISO-8859-1 used? What about names in non-latin1 charsets?
What about my name, for instance?

> and find a way to do pattern 
> matching and how to use "." and "@" in IAX to call SIP uri's - there are 
> many things to consider. (The @ in an IAX2 dialstring separates 
> extension from context...)

This is not a problem. See utf-8(7). An ASCII byte in a UTF-8 stream can
only be part of a single-byte ascii character. This is not UTF-16.

-- 
Tzafrir Cohen     icq#16849755  +972-50-7952406
tzafrir.cohen at xorcom.com  http://www.xorcom.com