asterisk users - Mar 2006 - Calls forwarding to numbers only in user's context

Hello,

I'm trying to do call forwarding based on this: 
http://www.voip-info.org/wiki/view/Asterisk+call+forwarding

In the extensions.conf file I have several context defined (local, 
longdistance, mobile, international and so on). Each user can be 
associated with different context (so can make only i.e. local calls). 
How to set calls forwarding only to numbers that are available in user's 
context (so if he has only locals calls he cannot set calls forwarding 
for mobile phones)?

I'm using this for forwarding:

[forwarding] ; available for all users
; Unconditional Call Forward
exten => _*21*X.,1,DBput(CFIM/${CALLERIDNUM}=${EXTEN:4})
exten => _*21*X.,2,Background(auth-thankyou)
exten => _*21*X.,3,Hangup
exten => #21#,1,DBdel(CFIM/${CALLERIDNUM})
exten => #21#,2,Background(auth-thankyou)
exten => #21#,3,Hangup

; Call Forward on Busy or Unavailable
exten => _*61*X.,1,DBput(CFBS/${CALLERIDNUM}=${EXTEN:4})
exten => _*61*X.,2,Background(auth-thankyou)
exten => _*61*X.,3,Hangup
exten => #61#,1,DBdel(CFBS/${CALLERIDNUM})
exten => #61#,2,Background(auth-thankyou)
exten => #61#,3,Hangup

[macro-call-forwarding]
exten => s,1,Set(temp=${DB(CFIM/${ARG1})})
exten => s,n,GotoIf(${temp}?cfim:nocfim)
exten => s,n(cfim),Dial(SIP/${temp}@ruter)   ; Unconditional forward
exten => s,n(nocfim),NoOp

exten => s,n,Dial(SIP/${ARG1},20,tTwW)

exten => s,n,Set(temp=${DB(CFBS/${ARG1})})
exten => s,n,GotoIf(${temp}?cfbs:nocfbs)
exten => s,n(cfbs),Dial(SIP/${temp}@ruter) ; Forward on busy or unavailable
exten => s,n(nocfbs),Goto(s-${DIALSTATUS},1) ; 
NOANSWER,BUSY,CHANUNAVAIL,CONGESTION,ANSWER

...

[incoming]
;
; Incoming calls.
;

exten => XXXXXYY,1,Macro(call-forwarding,YY)

-- 
Best regards,
Bartosz Piec

Bartosz Piec wrote:
> How to set calls forwarding only to numbers that are available in
user's
> context (so if he has only locals calls he cannot set calls forwarding
> for mobile phones)?
When the user sets the forwarding number, store the user's context in
the DB along with the forwarding number. Make sure you have an invalid
extension 'i' in the user's context as well.

For an incoming call, when the Dial returns busy or no answer, execute a
jump to the retrieved context/extension.  If the user doesn't have the
forwarding number in his context, the incoming call will land in the
invalid extension.

-Johnathan