IP Momentum VoIP uses the below ports for communicate the Voice/Account related to ISP/Account Providers,
TCP - 80,8080,9090
UDP - 5060, 5061, 6070, 6071, 17090 to 17100 , 9000 to 9006 , 10000 to 10006 , 20000 to 22000
http://netanalyst.blogspot.com/p/voip.html
