Maybe this a newby question, but I'm stock with something that maybe it's easy.
I had an installation with analog trunks connected to a gsm gateway, when an user call to a cell phone there is a delay about 15 seg when the user finished dialing the numer. I tested connecting directly to the gsm gateway and still have the delay (15 seg). Well you may said it's the gsm gateway but I need something to cheat the user.
I need to put a progress tone during that silence, any ideas.