Paul
Brett Tate wrote:
cpc parameter is to be defined as tel uri parameter, neither as sip uri parameter
nor as any header parameter.
So, I think, the correct answer is putting it in the user part of sip uri like:
From: <sip:+17005554141;[EMAIL PROTECTED]>;tag=1928301774
This issue is explained in detail in the section 19.1.6, RFC 3261.
The sip-uri parameter setting user=phone is also needed.
<sip:+17005554141;[EMAIL PROTECTED];user=phone>
Yes, it makes sense to use the cpc parameter in the user part when user=phone, because in that case the user part conforms to the tel url syntax.
There seems to be a potential issue when we don't have user=phone. Suppose we have sip:[EMAIL PROTECTED] Should there be some standard way to tell that this designates a payphone?
I have a feeling that the url is not the right place to do that - instead it ought to be incorporated into whatever certificate is used to authenticate the UA.
Paul
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