Problem with the flash cmd in a callback

Asterisk Asterisk Support
1

I’ve installed the last version of asterisk.

I have a callback fonction using my analogic line.
I want to use the 3-waycalling to let the person the server call to make another call through the same line as i can do with a phone connected to the physical line.

A solution?
Thx

2

I’ve tested the flash command but it hang up the line.