iRule to Hunt on SIP 503 Response
In the telephony world, if an SBC receives a SIP 503 from one telco provider, it can hunt to the next one.
I have two servers in a pool that is associated with a virtual server with a SIP profile. Normally, if one of the servers responds with a SIP 503 error, it forwards that back to the caller.
I would like to set it up so that, if one server in the pool responds with a 503 error, the LTM goes on to try the other server in the pool.
F5 support didn't have any answer on this, but they thought it might be able to be done with an iRule and suggested DevCentral.