OK this is a very wierd situation. This company has two offices, one in Auckland and one in Wellington. The Auckland office has a trixbox installed which has two VFX trunks coming in, an 09 number and 04 number. Both have been setup with exactly the same settings (see below) and both can receive calls fine. However I can't ring out if I use the Auckland trunk on our outbound route, I get a message "all circuits are busy now, please try again later" however if I use the Wellington trunk it's fine. Any ideas?