Hello Daniel and Henning,
I have confirmed that it is indeed the out-dated Informix CSDK libraries that were at fault. I have updated said libraries to the latest version (clientsdk.4.10.FC9DE) and the crash no longer occurs. Kamailio is able to detect that a database connection is severed, gracefully handles it, and reconnects to the offline database once it's back online. I appreciate your responses to this item. I will go ahead and close this ticket now.
Thank you,
Karthik