Asterisk Contexts with OpenSIPS

I currently have OpenSIPS set up with users and most of my call handling. OpenSIPS won’t be able to handle things like Call Park, Hunt Groups, ACD, etc. So I want to send these types of requests to Asterisk. I also want to set Asterisk up as Multi Tenet. So my question is

How can I send requests to Asterisk and have them funnel into the specific context for that specific Tenet? So if customer from blah.com wants to park a call then the users phone sends a REFER message to OpenSIPS, OpenSIPS forwards that REFER to Asterisk and Asterisk sees that its from blah.com so it does the does the context in dialplan that is set up for blah.com

Any help or docs are appreciated.