Your post is not too clear. I am assuming that you have an OBi110 in the UK, connected to a landline, and wish all calls to that landline to ring on both an OBi110 in India and an OBiON app on an iPhone. If that's not correct, please describe your system in detail.
One the UK OBi, set Physical Interfaces -> LINE Port -> InboundCallRoute to
{pp(ob222333444),pp(ob222333555)}
where 222333444 is the OBiTalk number of the Obi in India and 222333555 is the OBiTalk number of your iPhone.
Turn off any other forwarding settings for the Line port.