HI. Hopefully someone can help. I have 2 lines, Comcast and Magic Jack on a Grandstream 4101 and I have 2 strange problems. Most everything works but: 1- When calling the Magic Jack line and it gets transferred to an extension, even after the caller hangs up or finishes leaving a message, the line stays connected for a long time. It won't release the port. 2- On the other line (comcast), if you place a call, hang up and call again without waiting waiting a minute or two, the caller gets a fax tone. I can still hear the default extension ring though. Suggestions? Thanks.