I am currently working in a implementation of a MX64 in a call center with load balancing of two diferent internet providers. The thing is, we have two asterix pbx servers working on and one router behind the MX64. The router has all the LAN of agents behind it. The MX64 must do the NAT forwarding for the pbx servers that received the calls from another big call center, and of course the calls must be forwarded from the servers to the router where is the agents lans. The thing is the calls are not being forwarded. We conected the servers direct to the internet like it was before, and just the router with the agents lan behing de MX64 and all agents conected just by one Internet provider, after that the agents couldn't hear the calls that was being forwarded. One thing i could notince is that the router has activated the SIP ALG protocol. Any clue how can i solved this problem?. ... View more