Re: [sip-clf] Request for Consensus: Adopt ASCII

[Peter Musgrave <[e-mail]>]

Hi Vijay, 

Maybe we can do something simple (but not perfect)
- for empty field
? for unparsable field

In practice a tag or other field which contains the literal text - or ? would not be distinguishable from empty/unparsable, but I view that as a very remote case. We could go down the rat-hole of escaping them, but then e.g. a tag could legitimately contain the exact escaped sequence etc. etc. 

Peter

On 2010-12-02, at 4:59 PM, Vijay K. Gurbani wrote:

> On 12/02/2010 03:25 PM, Peter Musgrave wrote:
>> I see a need for a distinction between a tag which is not present
>> (because e.g. it's a new INVITE with no from tag, or a request and hence
>> has no response code) - versus a message in which the tag or response
>> code failed to parse.
>> 
>> ? for both does not allow this distinction.
> 
> Indeed, I was afraid that we may want to make that distinction.
> 
> If we want to make that distinction, then a variation of what
> you suggested earlier ("Stick with - and come up with some escape
> sequence for it") seems appropriate.  Or maybe some sort of a
> digraph (--) or trigraph (---).
> 
> Thanks,
> 
> - vijay
> -- 
> Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
> 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
> Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}
> Web:   http://ect.bell-labs.com/who/vkg/