asterisk users - May 2007 - Sending a SIP INVITE without SDP from Asterisk

Hello list,

I have a question here that may be a little bit strange for some of you.

I would like to send an INVITE from Asterisk to a given client  
without any SDP anouncement in it. Indeed, that is pretty useful for  
Click to call applications for instance, where you have no way to  
know which codecs are supported by the client you try to reach.  
Moreover, you let the client decide the order of the codecs in the  
anouncement.

So if anybody has an hint about how to do that, I would be pleased to  
hear from him.

Thank you in advance for your answers,

Antoine