[Serusers] how to change parallel forking

[Zappasodi Daniele]

Hello,
I need to implement a variation in the parallel forking: 
in the standard parallel forking SER waits the first 2xx and then sends a CANCELs to all pending branches. If one of the receiver refuses the call, the other destinations continue ringing until all the branches fail or there is a 2xx.
I need to change this behaviour in order to have SER that stops the forking and sends the CANCELs for each final reply, both 2xx and negative reply.
How can I do? 
Can I obtain this scenario working only with the config file, maybe with SPIRAL or with two SER instances?



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