We have a BCM 3.7 with i2004 phones. It is networked using VoIP trunks to a CSE1000 that's connected to an opt. 81c. We are experiencing an intermittent problem connecting to cellphones from the BCM end. When the call fails I get "No User Response" in the display with error code 18. I did a network capture, and I can see where the BCM sends an "H.225. CS: releaseComplete" to the Gatekeeper. If you call the same number enough times you will eventually get through. Also, when the call fails to connect, we get a busy signal at the BCM end, and the cellphone gets a quick ring. I have used the BCM Monitor to look at the calls, but just can't seem to find the problem. The tech at the Opt. 81c is pointing the finger at the BCM, but I am not sure where to go from here. Any help will be greatly appreciated.