1st, you are putting the code in the wrong place.
It should be in the X_InboundCallRoute for the SP where
VOIP.ms is defined.
This is probably the wrong method to use.
What OBi is
VOIP.ms defined?
Is it defined on the OBi110 and the OBi200?
Let's assume
Voip.ms is defined only on the OBi110 SP1 and not on the OBi200.
On the OBi110:
Voice Services -> SP1 Service -> X_InboundCallRoute:
ph,pp(510xxxxxx)
When you only have 1 rule, the curly brackets are optional.
The OB in the OBi number is optional.
The call comes into the OBi110, rings the Phone Port and also routes the call to the OBi200.
On the OBi200
Voice Services -> OBiTalk Service -> InboundCallRoute
Remove any code routing calls from the OBi110 to the Auto Attendant (aa).
Another method is to setup a sub account on
VOIP.ms for the OBi200
http://wiki.voip.ms/article/Sub_Accounts#How_to_Create_a_Sub_AccountRegister the OBi200 to the sub-account.
In
VOIP.ms route inbound calls to the main account and the sub-account.
I'm not familiar with
VOIP.ms, so I can't tell you how to do the routing.
I hope the OBi numbers for the OBi110 and OBi200 that you posted are not the real numbers.
If they are, I suggest changing them in your post.