Hi, I'm trying to accomplish the following setup: I have: - sip account at a provider, national one. - Elastix server - BRI ISDN card - ISDN pbx I would like to use the ISDN PBX to call with using my old solution. I have added an ISDN card to a Elastix Box and set it as NT. I made a ISDN-crossover cable for between the Elastix server and the ISDN pbx. This all works kinda OK, I get a dailtone when I pick up the telephone that is attached to the ISDN PBX, yes and this is a dialtone from the Elastix server what I hear. I have setup a SIP trunk with my sip account, and show sip peers shows me an OK. now I actually need to accomplish that the number, sip account, that I dail will be forwarded to the ISDNcard/ISDNpbx. And when I want to call from my ISDN-PBX that the outside route is using my sip account. I'm a little bit confused here because I don' t know for sure of I need more than one trunk for this because of the NT card that' s in it. Can someone advise me here or give me some nice examples for my situation ? I have tested and searched the whole day about this, but I don't see this setup happening a lot. Thanks.