5/25/2023 0 Comments Application layer gateway![]() Internet telephony uses the Session Initiation Protocol (SIP) to establish phone calls (or other multimedia sessions). The problem with NAT & Firewalls SIP & SDP ![]() 6.1.1 Port preserving with symmetric fallback.6 Examples of misbehaving network devices.5.1 'Nice' routers (compliant with RFC 4787).5 Interworking of STUN and NAT routers in practice.4.1 Overview of the different STUN modes.4 Behavior of the HiPath / Openscape system. ![]()
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