Documentation on using Trunk Group?

[twinclouds]

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.

[QBZappy]

@twinclouds

This might help
    
Use of Trunk Group (TGn) for call route fallback
http://www.obitalk.com/forum/index.php?topic=6266.0

[drgeoff]

Have you consulted page 132 of http://www.obihai.com/docs/OBiDeviceAdminGuide.pdf ?

[twinclouds]

@twinclouds

This might help
    
Use of Trunk Group (TGn) for call route fallback
http://www.obitalk.com/forum/index.php?topic=6266.0

@QBZappy:
I took a quick look and will study it more carefully.  It may be helpful for my problem.  I will ask for help later once I go through it.

[twinclouds]

Have you consulted page 132 of http://www.obihai.com/docs/OBiDeviceAdminGuide.pdf ?

I did.  However, I still don't know if it is sufficient to put the trunks into the group, then, simply put Trunk Group 1 as the primary line sufficient?  Another question is, how I can test it if it is working as supposed to be.  I put a wrong password in VOIP line registration so it did not register.  The call didn't fall down to the send entry.  I just hear an announcement that the call cannot be made.
I just tried again.  It was still the same.