Problem configurating dadhi trunks

Hellow,

I have an elastix 1.5 installated, with the asterisk-es-rsp patchset. I also have a Digium b410p installed. The problem is that the elastix recognizes the Digium tarjet but i can´t dial out through my RDSI channel.

I think I have a problem with the definition of the trunks (I´m not sure if I have to define a custom string ( and what is the custom string) or if I have to define a zap (dadhi compatibility mode) trunk.

If there is someone who has configurated The Digium b410p with dadhi and could tell me how to do this, I´ll be very grateful