Is there anyway to destroy a sip channel ? I get hung up channels like this in sip show channels: 67.153.9.20 2145558260 33ae28f6088 00102/00000 unknow 67.153.9.20 2145558260 52be8085005 00102/00000 unknow 67.153.9.20 2145558260 4653d937578 00102/00000 unknow 67.153.9.20 2145558260 2f9bc49d03a 00102/00000 unknow