Bill,Your VoIP system should be configured to register with the server. This would
maintain the link.I'm not sure what client/server you're using, but there may be a
time, timeout or keepalive (etc.) setting in the configuration options for the Callcentric
service.If you are configured to receive blind SIP calls/packets into your Public IP at
udp/5060 or something, Carrier Grade NAT would hinder that method.--- KB3VWG