Re: Implementation detail about tags.

[Shail Bhatnagar <[e-mail]>]

Rick Dean wrote:
> 
> Whenever my SIP UA sends an invite,
> it includes a "From" tag.  This makes the case
> of me calling myself through
> a proxy easier.  Otherwise, matching messages to
> call-leg-ends is more painful.  I believe this
> is allowable within the spec, and you have now
> been warned, so don't let it break your stack.
> 
> When responding to an invite, I always include
> a "to" tag even though I sometimes don't have to.
> Thus, if I ever receive a invite with a "to" tag, yet have
> no record of the call, I know the invite is
> a re-invite, and either could be for someone else
> or is ancient, thus I return "481 Call Leg
> does not exist".

Not sure what this achieves. When you say "yet have no record of
the call", you have probably done some kind of lookup based on 
Call-ID. It does not optimize your decision to send 481 in any
way, does it ?

> 
> Does anyone have a problem with this?
> 
> --
> Rick Dean
> 3Com