Obihai Support Team 说的和你一样 and that works!

1.
If you have already added your OBi110 to OBiTALK, then it's best to use
OBiTALK's
Device Configuration to setup your SIP account,
instead of using obihai's "SIP Account Configuration Wizard for ITSP or IP
PBX"

You can only have one Primary line.
If you have configured your SP2 to being Primary Line, then to call out
using SP1,
you need to dial **1 <number>

2.
Again, if your OBi device is in OBiTALK, then to change its configuration,
you should
use OBiTALK's "OBi Expert Configuration", instead of manually changing from
OBi's
local webpage.
 
Once you have added your OBi to OBiTALK, it is under provisioning. That is
probably why
your changes gets overwritten.


You can configure SP1 for Google Voice and SP2 for Nonoh

-Obihai Support Team