STUN and VoIP – part 1

STUN stands for Simple Traversal of User Datagram Protocol (UDP) through Network Address Translators (NAT’s). It is used in several different network implementations and scenarios, one of which is VoIP. Because of the way protocols used in a SIP based VoIP call work, making calls between two SIP entities running behind NAT devices such as a router or firewall, users typically encounter problems. Examples are one way audio during a phone call or phone registration failures when trying to register to a VoIP provider or a IP PBX not residing on the same network. STUN is a protocol that helps in resolving problems. Read the full article here.

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  1. Monali

    Does 3CX phonesystem come with an inbuilt STUN Server?

    January 28, 2009 at 4:29 pm
  2. There is no need for a PBX to have a STUN server. The stun server is separate and only useful when located outside the LAN.

    January 28, 2009 at 4:34 pm