[Users] Tricky Question

Here's a tricky question for the list. I have phones registering with OpenSER. After authenticating and saving the location, it forwards each registration request onto multiple Asterisk systems who send back Trying, OK, etc. OpenSER forwards these back to the phones eventhough they don't need to be. I want to stop them from getting back to the phones, because from the phone's perspective they've already registered, and now these extra Trying, Ok messages are coming back. Furtunately it doesn't seem to be causing any problems for the Polycom phones, but I'd still like ton get rid of them. How....? Maybe call setflag() when I get a registration, and then look for messages coming back with the flag? Doug