I tried to use the trunk group feature on my OBI110. I want to put three trunk, a VOIP service, a PSTN line and a SIP extension on Asterisk in the group. When dial out a number, if one fails, the call will try to use the next one. However, I have difficulty to find documentation about how to use this feature. I tried a few things based people more experienced about Obi devices but didn't work under my conditions. I noticed that there was a 3 years old post saying the documentation are coming but I don't know where to find it. I would really appreciate if someone can let me know if such documentation exist or give me some instructions to tell me how I can do that and how to test to make sure it is working. Thanks in advance.