As Voice over IP calls share the same data circuit uploads and downloads may degrade call quality. Firewalls should prioritize call traffic above other protocols.                   IPFone recommends the following settings for any type of firewall that will be handling VoIP traffic. Below is the list of IP addresses and TCP/UDP ports required to be allowed and prioritized:                   207.231.213.137 38.114.107.4 38.114.107.12 67.63.33.51 67.63.35.16467.63.35.11 67.63.36.116 67.63.33.160/27 68.67.214.0/25                   SIP traffic TCP/UDP: 5060, 5075Voice/Video UDP ports to/from: 8000 - 65535                   We appreciate your time and look forward to serving you.                   IPFone Support TeamSupport Telephone: (877) 781-6280 Support Email: support@ipfone.com