I have set up an internal office to office SIP trunk and have tested it with success. However, I need to route outside Zap/Dahdi calls over the internal SIP trunk but it fails. I suspect the the call is denied based on context but don't know where to take it from here. Also, how do I add extensions to Elastix for phones that are on the other end of a SIP trunk? The incoming routing configuration requires an actual number from the drop down list. I got around this by creating a ring group, which allows free form phone numbers.