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Frequently Asked Questions  Engineering     What is TOS?    Are my VoIP calls secure?    Does FTS support IAX trunking?    How do I handle a NAT-traversal issue?    How do I know that I?m having a NAT-traversal issue?    How does FTS ensure call quality?    How is SIP affected by NAT traversal?    How much bandwidth does each phone call take?    How much internet speed do I need?    Is my VoIP system secure?    What codecs do you support?    What is a Dedicated Voice Connection?    What is call QoS?    What is E.164 Numbering?    What is NAT traversal?    What is SIP trunking?    What is Traffic Shaping?    What is Voice Optimized Internet?    Why should I go with SIP?    Will your SIP trunks work over our existing data connection?