[SR-Users] Trying to fail a call over after 200 OK

Hi Everyone: I would appreciate your insight regarding a problem we are trying to solve. We are using Kamailio (4.1.8) along with multiple asterisk (13 and above) clusters for various telephony features. We are using the dispatcher module to send calls to the asterisk clusters in round robin and failover algorithms. We need a solution to fail a call and hand it over to another asterisk server after Kamailio has received a 200OK from Asterisk server A. I understand the failover works before the 200OK is sent from asterisk A and calls can easily be sent to asterisk B but again the challenge here to fail the call over to another asterisk server after a 200OK is received from the first one. If this is impossible I was wondering if refer and re-direct is an option to get this done. Thanks in advance for looking at this and for your responses.