configuring opensips -- 2

We want below thing to setup in Opensips : When User A is offline and User B calls to A, then Opensips should send Push notification to User A. (Opensip Side) User A will send SIP REGISTER to Opensips. (App side) Opensips will receive the SIP Register success event and send SIP INVITE to User A. (Opensip Side) User A will ring and answer the call. (App Side) In Above flow, App side is implemented. We need to add route in Opensips for above [login to view URL] want below thing to setup in Opensips : [login to view URL] [login to view URL],[login to view URL]