Settings for your OBi110:
Assuming that your OBi110 SIP provider is on sp1, then:
Voice Services > SP1 Service > X_InboundCallRoute:
{12345678901:pp(ob500123456)},{ph}
Where 12345678901 is your GV number, 500123456 is your OBi200 OBiTALK number.
Voice Services > OBiTALK Service > InboundCallRoute:
{(500123456)>(xx.):sp1},{500123456:aa},{ph}
Settings for your OBi200:
Look in:
Physical Interfaces > PHONE Port > OutboundCallRoute for this rule:
{(Mpli):pli}
Delete it and replace it with this rule:
{(<ob200123456*>(Mpli)):pp}
Where 200123456 is the OBiTALK number of your OBi110
Voice Services > OBiTALK Service > InboundCallRoute:
ph
If both OBi devices are in the same account, the OBiTALK portal will have put them in each others' Circle of Trust. If so, then delete any settings in both devices here:
Voice Services > OBiTALK Service > InboundCallRoute
and replace with the settings shown above.
I've assumed that your SIP provider in loc 1 accepts calls dialled using the same format as GV. When you dial from loc 2 whatever you dial should go via the OBi110 at loc 1 out on sp1 with no format changes. We can play around with the digitmaps further if the number formats need changing.
Let us know how you get on. This may be useful to others who own more than one OBi and use GV at the moment.