Incoming Routes TG200


I started testing today TG200 with my grandstream pbx.

I have 2 sim cards inserted and I want to do following.
When someone calls on SIM1 to go to ext IVR1 and when someone calls SIM2 to go to IVR2. (i've done that).
Problem I have with outgoing calls.
I need EXT1 to go out with GSM 1 and ext2 with GSM2. 
In the configuration of TG200 I was unable to find Source to filter the routes. In the log i see source and destination.

any advice ? 

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