I would recommend the following:
- delete both phone lines.
- create gizmo5 and test it. Is it working? If yes, go to webadmin -> advanced -> configuration -> phone setup and take note of ALL configurations (trunk, incoming, outbond).
- delete gizmo5
- webadmin -> phone lines -> create linksys spa3102
- test it. is it working? If yes, go to webadmin -> advanced -> configuration -> phone setup and take note of ALL configurations (trunk, incoming, outbond).
- go to webadmin -> advanced -> configuration -> phone setup and create the gizmo5 trunk.
- adjust dial patterns and rules, so local go thru spa3102 and long distance and internation go thru gizmo5 (or the way you want to)
- test it.
Let me know how it goes, so i can help you.
I do thave 3 trunks working (spa3102, voipcheap and sipgate), having the dial patterns and rules routing calls thru the trunks. Had some work in finding out how to have all working, but it works fine.