Akuvox E21 Series - Transport Type; Nat

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3.3.5. Transport Type
To display and configure Transport type for SIP message.
 UDP: UDP is an unreliable but very efficient transport
layer protocol.
 TCP: Reliable but less-efficient transport layer protocol.
 TLS: Secured and Reliable transport layer protocol.
 DNS-SRV: A DNS RR for specifying the location of
services.
3.3.6. NAT
To display and configure NAT(Net Address Translator)
settings.
 STUN: Short for Simple Traversal of UDP over NATS, a
solution to solve NAT issues.
Note: By default, NAT is disabled.