asterisk users - Jan 2004 - Asterisk Gotoif / last called

Hi guys

Ive been trying to get this to work for ages now, basicaly im trying to do if
${woteva} = "" (nothing), or its none existenant then do label 1, else
label 2. for my last called function, so it will play a different message if
theres no last call in the system or it was anonymous.
ive tried 

exten => 1000,1,GotoIf($[${last-call${CALLERIDNUM}} = ""]?4:5)
and heaps of other combinations, most times it ses syntax error when im in
asterisk verbose more when it loads the gotoif. I know the variable
${last-call${CALLERIDNUM}} as i tested it before it loads the gotoif line. Does
anyone know howto do this ??
Also say in my example above, its true so it goes to 4, does that mean it goes
to extension 4.. or rule 4 in that dialplan ?

thanks heaps for all your help :)

p.s i dunno if asterisk comes with a last caller function, and theres probs
heaps better ways to do it, but if u wana do it all i did was



;line 2 and 3, makes a variable last-call2001 = whoever called, and sets the
time.

exten => 2001,1,Dial(SIP/2001,20)
exten => 2001,2,SetGlobalVar(last-call${EXTEN}=${CALLERIDNUM})
exten => 2001,3,SetGlobalVar(2001date=${DATETIME})
exten => 2001,4,Voicemail(u2001)
exten => 2001,104,Voicemail(b2001)
exten => 2001,105,Hangup

; say your last call ; gets the callerid and then plays
last-call'callerid'

exten => 128,1,Answer
exten => 128,2,Wait(1)
exten => 128,3,Playback(lastmisscall)
exten => 128,4,SayDigits(${last-call${CALLERIDNUM}})
exten => 128,5,Playback(lastcallat)
exten => 128,6,Datetime(${2001date})
exten => 128,7,Playback(thankyoucome)
exten => 128,8,Wait(1)
exten => 128,9,Hangup


oh while im asking.. is there a way to make global changes to a context.. cause
ive got a dialplan for each user in a context obviously, but instead of having
to put these 2 lines
exten => 2001,2,SetGlobalVar(last-call${EXTEN}=${CALLERIDNUM})
exten => 2001,3,SetGlobalVar(2001date=${DATETIME})
in each user dialplan could i just put it once and make it load everytime
someone in that context is called ?

thanks again heaps :)

Hi
> Ive been trying to get this to work for ages now, basicaly im trying
> to do if ${woteva} = "" (nothing), or its none existenant then do
> label 1, else label 2. for my last called function, so it will play a
> different message if theres no last call in the system or it was
> anonymous. ive tried 
There is a way to  test for an empty string:
  GotoIf($[${CALLERIDNUM} = ]?3:2)
> exten => 1000,1,GotoIf($[${last-call${CALLERIDNUM}} = ""]?4:5)
> and heaps of other combinations, most times it ses syntax error when
> im in asterisk verbose 
My guess is that this won't work. Instead look into DBput and DBget and
do something like 

  DBput(last-call/${CALLERIDNUM}=value)

The advantage of this is, by the way, that the last caller data will also 
be available after a restart of Asterisk.
> Also say in my example above, its true so it goes to 4, does that mean
> it goes to extension 4.. or rule 4 in that dialplan ? 
You'll jump to priority 4, not extension 4.
> oh while im asking.. is there a way to make global changes to a
> context 
Look at Macros.

Cheers, Philipp