http://www.cisco.com/c/en/us/solutions/enterprise/interoperability-portal/networking_solutions_products_genericcontent0900aecd805b561d.html#callmgr5http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/520102nt.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/529638nt.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/540220nt.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/209919ne.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/248705nn.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/246672pr.pdfhttps://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/207459nc.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/210877ne.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/248500ne.pdfhttp://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/207459nc.pdfhttp://www.ad-net.com.tw/index.php?id=220http://www.ad-net.com.tw/index.php?id=109http://www.benchmark-electronics.com/Files/OFT.pdfhttp://www.ijarcsse.com/docs/papers/May2012/Volum2_issue5/V2I500219.pdf