We have a two different setups one running ccm 4 and one running cucm 6. there is a non gatekeeper controlled intercluster trunk between ccm4 and cucm6, call managers are configured in publisher and subscriber scenario. Trunk is configured between publishers at both end.
Network running cucm6 has three subscribers, when we try to make a call from phones registered with subscribers every second call is completed. When i checked network capture result on subscriber and publisher I came to know that calls being load balanced between publisher and subscriber. When call is initiated from publisher its completed when its initiated via subscriber in goes uncompleted.
Also in one region calls are only going through subscriber so 100% failure on these calls.
Any idea how it can be resolved.