In our company (with approximately 40 extensions hanging on a legacy ISDN PBX) I want to implement Asterisk. At first, my idea is to get Elastix between the incoming/outgoing ISDN30 Line and the ISDN30 PBX. Am I correct assuming I need to do the following: * Insert a 2 PRI card / Astribank * Connect the incoming ISDN30 line to a PRI * Connect the Legacy PBX to the other PRI Setup trunks for both PRI's and setup Ingoing and Outgoing Routes to match the traffic? Our phone-numbers are 050-587XXXX so I make an * Set a 1st Outgoing Route for those DID's to go to the Legacy-PRI * Set a 2nd Outgoing Route for all external-numbers (0X) to the ISDN30-PRI Am I correct in assuming this way the Elastix server will simply 'tunnel' all traffic transparently? Once I got the basic 'gateway' sorted I will begin adding extensions to the Elastix-box and I will have to match Inbound Routes for those? Anyone have experience with a setup like this and can give me more insights, pointers, tips and tricks and problems I might run into ?