We have an ACD on a Samsung OS7400 that is sporadically not sending calls to the remote 3rd Party SIP phone that is logged in. The phone is up and if you call it directly, immediately after or at the same time as the failed ACD call, the 3rd party SIP device rings and can answer the call. Before the ACD was put in place, with the same call volume, no call ever failed to the remote phone. Has anyone ever heard of this?