Has anyone experienced any issues making calls (over IP) with Polycom VSX7000's behind pix/asa firewalls? Despite permitting open IP access between the two units, one unit will call and it will ring continiuously with the other side not receiving it. I also checked the firewall logs and it does not record any hits from either unit. If I had the same units call another site without a firewall (or at least a firewall that is running software version less than 7.0), it goes through fine. The firewall doesn't block it either because I don't see any deny messages but something is interfering with the call.