Changing the 'ringmobile' tone on Dahdi

Is it possible to change the ringback tone ie what a caller hears, when dialing out on a dahdi channel?
In particular I wanted to replace the ‘ringmobile’ ringback tone with the same ringback heard when calling a landline.
I tried entering the following into the ‘global settings’ Dahdi option thus:
ring = 413+438/400,0/200,413+438/400,0/2000
ringmobile = (same as ring above)
But the ‘ringmobile’ ringback tone was the same as usual
Is this possible?

The tones on analog lines are controlled by your provider, I don’t think you can modify them in any way, but I might be wrong.