[SR-Users] dispatcher and call transfer

Hi All, Currently we are running kamailio in a loadbalanced fashion whereby calls come in via the loadbalancers and distribute calls accross 2 media servers. We have come accross and issue whereby call transfers may be distributed accross two media servers and when the REFER message comes along to transfer the call, in some cases (if we're lucky) the message arrives at the wrong media server (transaction leg doesnt exist). Some googling later and it appears that dispatcher doesnt play nice when it comes to this scenario. Some suggestions popped up in my previous searches saying that a potential work around is to use the dialog module to check if a call is eastablished and then to send all calls to the same media server based on the dialog already being established. I'd appreciate some input from the guru's out there that have come accross this same issue and, if possible, some suggestions on how to work around the problem, does the dispatcher module have a hashing algorithm that can be suited for this particular scenario? Thanks in advance for any tips or sugestions.