Calling outbound hear transfer digits?

So I have a trixbox appliance running 2.6.2.3 with a Rhino FXO channel bank connected to a sangoma T1 card in my appliance. For testing purposes I have a generic outbound route setup, where 9|. goes out that T1 to the channel bank. Everything works as expected, inbound and outbound seem to be working great, sound quality etc is perfect.

But! and here is the odd one, when I dial a number say 95551234. Just before it is about to start ringing, I hear a series of digits(beeps) on the headset like it is transferring the call? I would like to remove these as I know it will drive our users insane, anyone have any ideas on where I have went wrong or what I need to do to remove them?

Thanks so much guys!