[Asterisk-video] parallel forking with early media

[zanet_tomas at libero.it]

Hi All,
I'd like to implement the scenario described in the following topic:

http://www.asteriskguru.com/board/parallel-forking-with-early-media-vt3808.html


Just to summarize, I need to send the early-media video from one-to-many 
SIPUAs.

First of all, is it possible to implement this feature?
If yes, Could 
someone address me to the right implementation? 

I'd like to know if these 
changes will affect only on creation of a new application (e.g. new Dial 
application) or will also affect the chan_sip.c and other core files (like rtp.
c). 
Because I wouldn't want to modify the original files of Asterisk but only 
create a new application for it (e.g. app_fork())...

In your opinion, is this 
feature difficult to be implemented?
Can someone help me, please? 

Thanks in 
advance.
Best Regards,

Tomas