asterisk users - Aug 2007 - Call forward at telco

Hello,
I want to enable call forwarding at my telco. In Germany you can press
*21*destination# and all calls will be redirected to the destination
without interaction with any equipment on my side.
How to dial this with Asterisk and Zap-Channels? It can not be send as
"called number", it has to be send as "keypad facility".
Anyone here with some hints? The application ZapSendKeypadFacility in
Asterisk 1.4 only supports answered channels if I read it correctly.
But my channel is not answered before sending *21*destination# (I get
a voice telling me the call forwarding is activated).

Thanks,
 Gunnar

On Thu, 9 Aug 2007, Gunnar Schaller wrote:
> Hello,
> I want to enable call forwarding at my telco. In Germany you can press
> *21*destination# and all calls will be redirected to the destination
> without interaction with any equipment on my side.
> How to dial this with Asterisk and Zap-Channels? It can not be send as
> "called number", it has to be send as "keypad
facility".
> Anyone here with some hints? The application ZapSendKeypadFacility in
> Asterisk 1.4 only supports answered channels if I read it correctly.
> But my channel is not answered before sending *21*destination# (I get
> a voice telling me the call forwarding is activated).
This doesn't work?

   exten => _*21*X.,1,Dial(Zap/1/*21*${EXTEN:4})

Then you can dial

   *21*destination#

then just push 'send' on your SIP phone and the system will dial it out 
for you... ??

or am I missing something...

Gordon