[Asterisk-Dev] IAX2 call variable passing between servers

[Dave Weis]

On Wed, 3 Dec 2003, Linus Surguy wrote:
> > > Two new applications are created to 'Set' these new variables, and
> 'Read'
> > > these new variables.
> >
> > Don't forget 'Delete' as sometimes you might want to strip something
> > out of the call state before handing off the call.
> I knew after I posted I should have mentioned it in the posting! I was
> thinking that:
> To Set:
> SetCallVar(BEARERCODE=${DATATYPE}) /* set callvar BEARERCODE to the *
> variable DATATYPE */
> To Read:
> GetCallVar(BEARERCODE,DATATYPE) /* read callvar BEARERCODE into the *
> variable DATATYPE */
> To Delete:
> SetCallVar(BEARERCODE=) /* unset and delete callvar BEARERCODE */

Is there a difference between a non-existant variable and a zero-length 
variable?

-- 
Dave Weis             "I believe there are more instances of the abridgment
djweis at sjdjweis.com   of the freedom of the people by gradual and silent
                      encroachments of those in power than by violent 
                      and sudden usurpations."- James Madison