I want to fork a new branch, while the first one is ringing.

Forking will take place in a rtimer process. 

So I will save the invite transaction in a htable, and using this transaction info I need to append a branch.

I saw TSILO module provides some methods to append branch.

However documentation says that it can be used when register message received.

What is the best way to implement this?

Thanks,

Koray