Avaya IP Office 8.1 Product Description page 282

Option 3: Connection to the ITSP over NAT using 3
servers in the network to discover the NAT mechanism being used.
Option 4: Connection to the ITSP through a router equipped with an Application Level Gateway (ALG) which
transparently resolves all NAT issues.
Product Description
IP Office 8.1
rd
party STUN (Simple Traversal of UDP through NAT)
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Page 282
Issue 26.k.- (16 August 2012)